diff --git a/src/arcaea_offline/database/db.py b/src/arcaea_offline/database/db.py
index f4ad1f8..9947aa3 100644
--- a/src/arcaea_offline/database/db.py
+++ b/src/arcaea_offline/database/db.py
@@ -5,7 +5,6 @@ from typing import Iterable, Optional, Type, Union
 from sqlalchemy import Engine, func, inspect, select
 from sqlalchemy.orm import DeclarativeBase, InstrumentedAttribute, sessionmaker
 
-from arcaea_offline.external.arcsong.arcsong_json import ArcSongJsonBuilder
 from arcaea_offline.singleton import Singleton
 
 from .models.v4.config import ConfigBase, Property
@@ -403,11 +402,3 @@ class Database(metaclass=Singleton):
         return self.__count_table(ScoreBest)
 
     # endregion
-
-    # region export
-    def generate_arcsong(self):
-        with self.sessionmaker() as session:
-            arcsong = ArcSongJsonBuilder(session).generate_arcsong_json()
-        return arcsong
-
-    # endregion
diff --git a/src/arcaea_offline/external/arcsong/__init__.py b/src/arcaea_offline/external/arcsong/__init__.py
deleted file mode 100644
index 28eda7b..0000000
--- a/src/arcaea_offline/external/arcsong/__init__.py
+++ /dev/null
@@ -1,3 +0,0 @@
-from .arcsong_db import ArcsongDbParser
-
-__all__ = ["ArcsongDbParser"]
diff --git a/src/arcaea_offline/external/arcsong/arcsong_db.py b/src/arcaea_offline/external/arcsong/arcsong_db.py
deleted file mode 100644
index cc4abb1..0000000
--- a/src/arcaea_offline/external/arcsong/arcsong_db.py
+++ /dev/null
@@ -1,34 +0,0 @@
-import sqlite3
-from typing import List
-
-from sqlalchemy.orm import Session
-
-from arcaea_offline.database.models.v4 import ChartInfo
-
-
-class ArcsongDbParser:
-    def __init__(self, filepath):
-        self.filepath = filepath
-
-    def parse(self) -> List[ChartInfo]:
-        results = []
-        with sqlite3.connect(self.filepath) as conn:
-            cursor = conn.cursor()
-            arcsong_db_results = cursor.execute(
-                "SELECT song_id, rating_class, rating, note FROM charts"
-            )
-            for result in arcsong_db_results:
-                chart = ChartInfo(
-                    song_id=result[0],
-                    rating_class=result[1],
-                    constant=result[2],
-                    notes=result[3] or None,
-                )
-                results.append(chart)
-
-        return results
-
-    def write_database(self, session: Session):
-        results = self.parse()
-        for result in results:
-            session.merge(result)
diff --git a/src/arcaea_offline/external/arcsong/arcsong_json.py b/src/arcaea_offline/external/arcsong/arcsong_json.py
deleted file mode 100644
index ce23d3a..0000000
--- a/src/arcaea_offline/external/arcsong/arcsong_json.py
+++ /dev/null
@@ -1,157 +0,0 @@
-import logging
-import re
-from typing import List, Optional, TypedDict
-
-from sqlalchemy import func, select
-from sqlalchemy.orm import Session
-
-from arcaea_offline.database.models.v4 import (
-    ChartInfo,
-    Difficulty,
-    DifficultyLocalized,
-    Pack,
-    Song,
-    SongLocalized,
-)
-
-logger = logging.getLogger(__name__)
-
-
-class TArcSongJsonDifficultyItem(TypedDict):
-    name_en: str
-    name_jp: str
-    artist: str
-    bpm: str
-    bpm_base: float
-    set: str
-    set_friendly: str
-    time: int
-    side: int
-    world_unlock: bool
-    remote_download: bool
-    bg: str
-    date: int
-    version: str
-    difficulty: int
-    rating: int
-    note: int
-    chart_designer: str
-    jacket_designer: str
-    jacket_override: bool
-    audio_override: bool
-
-
-class TArcSongJsonSongItem(TypedDict):
-    song_id: str
-    difficulties: List[TArcSongJsonDifficultyItem]
-    alias: List[str]
-
-
-class TArcSongJson(TypedDict):
-    songs: List[TArcSongJsonSongItem]
-
-
-class ArcSongJsonBuilder:
-    def __init__(self, session: Session):
-        self.session = session
-
-    def get_difficulty_item(
-        self,
-        difficulty: Difficulty,
-        song: Song,
-        pack: Pack,
-        song_localized: Optional[SongLocalized],
-    ) -> TArcSongJsonDifficultyItem:
-        if "_append_" in pack.id:
-            base_pack = self.session.scalar(
-                select(Pack).where(Pack.id == re.sub(r"_append_.*$", "", pack.id))
-            )
-        else:
-            base_pack = None
-
-        difficulty_localized = self.session.scalar(
-            select(DifficultyLocalized).where(
-                (DifficultyLocalized.song_id == difficulty.song_id)
-                & (DifficultyLocalized.rating_class == difficulty.rating_class)
-            )
-        )
-        chart_info = self.session.scalar(
-            select(ChartInfo).where(
-                (ChartInfo.song_id == difficulty.song_id)
-                & (ChartInfo.rating_class == difficulty.rating_class)
-            )
-        )
-
-        if difficulty_localized:
-            name_jp = difficulty_localized.title_ja or ""
-        elif song_localized:
-            name_jp = song_localized.title_ja or ""
-        else:
-            name_jp = ""
-
-        return {
-            "name_en": difficulty.title or song.title,
-            "name_jp": name_jp,
-            "artist": difficulty.artist or song.artist,
-            "bpm": difficulty.bpm or song.bpm or "",
-            "bpm_base": difficulty.bpm_base or song.bpm_base or 0.0,
-            "set": song.set,
-            "set_friendly": f"{base_pack.name} - {pack.name}"
-            if base_pack
-            else pack.name,
-            "time": 0,
-            "side": song.side or 0,
-            "world_unlock": False,
-            "remote_download": False,
-            "bg": difficulty.bg or song.bg or "",
-            "date": difficulty.date or song.date or 0,
-            "version": difficulty.version or song.version or "",
-            "difficulty": difficulty.rating * 2 + int(difficulty.rating_plus),
-            "rating": chart_info.constant or 0 if chart_info else 0,
-            "note": chart_info.notes or 0 if chart_info else 0,
-            "chart_designer": difficulty.chart_designer or "",
-            "jacket_designer": difficulty.jacket_desginer or "",
-            "jacket_override": difficulty.jacket_override,
-            "audio_override": difficulty.audio_override,
-        }
-
-    def get_song_item(self, song: Song) -> TArcSongJsonSongItem:
-        difficulties = self.session.scalars(
-            select(Difficulty).where(Difficulty.song_id == song.id)
-        )
-
-        pack = self.session.scalar(select(Pack).where(Pack.id == song.set))
-        if not pack:
-            logger.warning(
-                'Cannot find pack "%s", using placeholder instead.', song.set
-            )
-            pack = Pack(id="unknown", name="Unknown", description="__PLACEHOLDER__")
-        song_localized = self.session.scalar(
-            select(SongLocalized).where(SongLocalized.id == song.id)
-        )
-
-        return {
-            "song_id": song.id,
-            "difficulties": [
-                self.get_difficulty_item(difficulty, song, pack, song_localized)
-                for difficulty in difficulties
-            ],
-            "alias": [],
-        }
-
-    def generate_arcsong_json(self) -> TArcSongJson:
-        songs = self.session.scalars(select(Song))
-        arcsong_songs = []
-        for song in songs:
-            proceed = self.session.scalar(
-                select(func.count(Difficulty.rating_class)).where(
-                    Difficulty.song_id == song.id
-                )
-            )
-
-            if not proceed:
-                continue
-
-            arcsong_songs.append(self.get_song_item(song))
-
-        return {"songs": arcsong_songs}
diff --git a/src/arcaea_offline/external/exporters/arcsong/__init__.py b/src/arcaea_offline/external/exporters/arcsong/__init__.py
new file mode 100644
index 0000000..54ad51f
--- /dev/null
+++ b/src/arcaea_offline/external/exporters/arcsong/__init__.py
@@ -0,0 +1,3 @@
+from .json import ArcsongJsonExporter
+
+__all__ = ["ArcsongJsonExporter"]
diff --git a/src/arcaea_offline/external/exporters/arcsong/definitions.py b/src/arcaea_offline/external/exporters/arcsong/definitions.py
new file mode 100644
index 0000000..9c1f301
--- /dev/null
+++ b/src/arcaea_offline/external/exporters/arcsong/definitions.py
@@ -0,0 +1,35 @@
+from typing import List, TypedDict
+
+
+class ArcsongJsonDifficultyItem(TypedDict):
+    name_en: str
+    name_jp: str
+    artist: str
+    bpm: str
+    bpm_base: float
+    set: str
+    set_friendly: str
+    time: int
+    side: int
+    world_unlock: bool
+    remote_download: bool
+    bg: str
+    date: int
+    version: str
+    difficulty: int
+    rating: int
+    note: int
+    chart_designer: str
+    jacket_designer: str
+    jacket_override: bool
+    audio_override: bool
+
+
+class ArcsongJsonSongItem(TypedDict):
+    song_id: str
+    difficulties: List[ArcsongJsonDifficultyItem]
+    alias: List[str]
+
+
+class ArcsongJsonRoot(TypedDict):
+    songs: List[ArcsongJsonSongItem]
diff --git a/src/arcaea_offline/external/exporters/arcsong/json.py b/src/arcaea_offline/external/exporters/arcsong/json.py
new file mode 100644
index 0000000..52fecbf
--- /dev/null
+++ b/src/arcaea_offline/external/exporters/arcsong/json.py
@@ -0,0 +1,98 @@
+import logging
+import re
+from typing import List, Optional
+
+from sqlalchemy import select
+from sqlalchemy.orm import Session
+
+from arcaea_offline.constants.enums.arcaea import ArcaeaLanguage
+from arcaea_offline.database.models.v5 import Difficulty, Pack, Song
+
+from .definitions import ArcsongJsonDifficultyItem, ArcsongJsonRoot, ArcsongJsonSongItem
+
+logger = logging.getLogger(__name__)
+
+
+class ArcsongJsonExporter:
+    @staticmethod
+    def craft_difficulty_item(
+        difficulty: Difficulty, *, base_pack: Optional[Pack]
+    ) -> ArcsongJsonDifficultyItem:
+        song = difficulty.song
+        pack = song.pack
+        chart_info = difficulty.chart_info
+
+        song_localized_ja = next(
+            (lo for lo in song.localized_objects if lo.lang == ArcaeaLanguage.JA),
+            None,
+        )
+        difficulty_localized_ja = next(
+            (lo for lo in difficulty.localized_objects if lo.lang == ArcaeaLanguage.JA),
+            None,
+        )
+
+        if difficulty_localized_ja:
+            name_jp = difficulty_localized_ja.title or ""
+        elif song_localized_ja:
+            name_jp = song_localized_ja.title or ""
+        else:
+            name_jp = ""
+
+        return {
+            "name_en": difficulty.title or song.title,
+            "name_jp": name_jp,
+            "artist": difficulty.artist or song.artist,
+            "bpm": difficulty.bpm or song.bpm or "",
+            "bpm_base": difficulty.bpm_base or song.bpm_base or 0.0,
+            "set": song.pack_id,
+            "set_friendly": f"{base_pack.name} - {pack.name}"
+            if base_pack
+            else pack.name,
+            "time": 0,
+            "side": song.side or 0,
+            "world_unlock": False,
+            "remote_download": False,
+            "bg": difficulty.bg or song.bg or "",
+            "date": difficulty.date or song.date or 0,
+            "version": difficulty.version or song.version or "",
+            "difficulty": difficulty.rating * 2 + int(difficulty.rating_plus),
+            "rating": chart_info.constant or 0 if chart_info else 0,
+            "note": chart_info.notes or 0 if chart_info else 0,
+            "chart_designer": difficulty.chart_designer or "",
+            "jacket_designer": difficulty.jacket_desginer or "",
+            "jacket_override": difficulty.jacket_override,
+            "audio_override": difficulty.audio_override,
+        }
+
+    @classmethod
+    def craft(cls, session: Session) -> ArcsongJsonRoot:
+        songs = session.scalars(select(Song))
+
+        arcsong_songs: List[ArcsongJsonSongItem] = []
+        for song in songs:
+            if len(song.difficulties) == 0:
+                continue
+
+            pack = song.pack
+            if "_append_" in pack.id:
+                base_pack = session.scalar(
+                    select(Pack).where(Pack.id == re.sub(r"_append_.*$", "", pack.id))
+                )
+            else:
+                base_pack = None
+
+            arcsong_difficulties = []
+            for difficulty in song.difficulties:
+                arcsong_difficulties.append(
+                    cls.craft_difficulty_item(difficulty, base_pack=base_pack)
+                )
+
+            arcsong_songs.append(
+                {
+                    "song_id": song.id,
+                    "difficulties": arcsong_difficulties,
+                    "alias": [],
+                }
+            )
+
+        return {"songs": arcsong_songs}
diff --git a/src/arcaea_offline/external/importers/arcsong.py b/src/arcaea_offline/external/importers/arcsong.py
new file mode 100644
index 0000000..5ed20b9
--- /dev/null
+++ b/src/arcaea_offline/external/importers/arcsong.py
@@ -0,0 +1,38 @@
+import sqlite3
+from typing import List, overload
+
+from arcaea_offline.constants.enums.arcaea import ArcaeaRatingClass
+from arcaea_offline.database.models.v5 import ChartInfo
+
+
+class ArcsongDatabaseImporter:
+    @classmethod
+    @overload
+    def parse(cls, conn: sqlite3.Connection) -> List[ChartInfo]: ...
+
+    @classmethod
+    @overload
+    def parse(cls, conn: sqlite3.Cursor) -> List[ChartInfo]: ...
+
+    @classmethod
+    def parse(cls, conn) -> List[ChartInfo]:
+        if isinstance(conn, sqlite3.Connection):
+            return cls.parse(conn.cursor())
+
+        assert isinstance(conn, sqlite3.Cursor)
+
+        results = []
+        db_results = conn.execute(
+            "SELECT song_id, rating_class, rating, note FROM charts"
+        )
+        for result in db_results:
+            results.append(
+                ChartInfo(
+                    song_id=result[0],
+                    rating_class=ArcaeaRatingClass(result[1]),
+                    constant=result[2],
+                    notes=result[3] or None,
+                )
+            )
+
+        return results
diff --git a/tests/external/importers/test_arcsong.py b/tests/external/importers/test_arcsong.py
new file mode 100644
index 0000000..fb5104b
--- /dev/null
+++ b/tests/external/importers/test_arcsong.py
@@ -0,0 +1,45 @@
+import sqlite3
+
+import tests.resources
+from arcaea_offline.constants.enums.arcaea import ArcaeaRatingClass
+from arcaea_offline.database.models.v5 import ChartInfo
+from arcaea_offline.external.importers.arcsong import (
+    ArcsongDatabaseImporter,
+)
+
+db = sqlite3.connect(":memory:")
+db.executescript(
+    tests.resources.get_resource("arcsong.sql").read_text(encoding="utf-8")
+)
+
+
+class TestArcsongDatabaseImporter:
+    def test_parse(self):
+        items = ArcsongDatabaseImporter.parse(db)
+
+        assert all(isinstance(item, ChartInfo) for item in items)
+        assert len(items) == 3
+
+        base1_pst = next(
+            it
+            for it in items
+            if it.song_id == "base1" and it.rating_class is ArcaeaRatingClass.PAST
+        )
+        assert base1_pst.constant == 30
+        assert base1_pst.notes == 500
+
+        base1_prs = next(
+            it
+            for it in items
+            if it.song_id == "base1" and it.rating_class is ArcaeaRatingClass.PRESENT
+        )
+        assert base1_prs.constant == 60
+        assert base1_prs.notes == 700
+
+        base1_ftr = next(
+            it
+            for it in items
+            if it.song_id == "base1" and it.rating_class is ArcaeaRatingClass.FUTURE
+        )
+        assert base1_ftr.constant == 90
+        assert base1_ftr.notes == 1000
diff --git a/tests/resources/arcsong.sql b/tests/resources/arcsong.sql
new file mode 100644
index 0000000..c4b1fad
--- /dev/null
+++ b/tests/resources/arcsong.sql
@@ -0,0 +1,40 @@
+CREATE TABLE packages(
+    `id` TEXT PRIMARY KEY NOT NULL,
+    `name` TEXT NOT NULL DEFAULT ""
+);
+
+CREATE TABLE charts(
+    song_id TEXT NOT NULL DEFAULT '',
+    rating_class INTEGER NOT NULL DEFAULT 0,
+    name_en TEXT NOT NULL DEFAULT '',
+    name_jp TEXT DEFAULT '',
+    artist TEXT NOT NULL DEFAULT '',
+    bpm TEXT NOT NULL DEFAULT '',
+    bpm_base DOUBLE NOT NULL DEFAULT 0,
+    `set` TEXT NOT NULL DEFAULT '',
+    `time` INTEGER DEFAULT 0,
+    side INTEGER NOT NULL DEFAULT 0,
+    world_unlock BOOLEAN NOT NULL DEFAULT 0,
+    remote_download BOOLEAN DEFAULT '',
+    bg TEXT NOT NULL DEFAULT '',
+    `date` INTEGER NOT NULL DEFAULT 0,
+    `version` TEXT NOT NULL DEFAULT '',
+    difficulty INTEGER NOT NULL DEFAULT 0,
+    rating INTEGER NOT NULL DEFAULT 0,
+    note INTEGER NOT NULL DEFAULT 0,
+    chart_designer TEXT DEFAULT '',
+    jacket_designer TEXT DEFAULT '',
+    jacket_override BOOLEAN NOT NULL DEFAULT 0,
+    audio_override BOOLEAN NOT NULL DEFAULT 0,
+    PRIMARY KEY(song_id, rating_class)
+);
+
+
+INSERT INTO packages ("id", "name") VALUES
+    ('base', 'Base Pack'),
+    ('core', 'Core Pack');
+
+INSERT INTO charts ("song_id", "rating_class", "name_en", "name_jp", "artist", "bpm", "bpm_base", "set", "time", "side", "world_unlock", "remote_download", "bg", "date", "version", "difficulty", "rating", "note", "chart_designer", "jacket_designer", "jacket_override", "audio_override") VALUES
+    ('base1', '0', 'Base song 1', 'ベース・ソング・ワン', 'Artist', '1024', '1024.0', 'base', '1024', '1', '1', '0', '', '1400067914', '1.0', '6', '30', '500', 'Charter', '78rwey63a', '0', '0'),
+    ('base1', '1', 'Base song 1', 'ベース・ソング・ワン', 'Artist', '1024', '1024.0', 'base', '1024', '1', '1', '0', '', '1400067914', '1.0', '12', '60', '700', 'Charter', '78rwey63b', '0', '0'),
+    ('base1', '2', 'Base song 1', 'ベース・ソング・ワン', 'Artist', '1024', '1024.0', 'base', '1024', '1', '1', '0', '', '1400067914', '1.0', '18', '90', '1000', 'Charter', '78rwey63c', '0', '0');