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Lingering Echoes OST is an Arknights original soundtrack containing four BGMs from the titular Side Story event.

Tracklist[]

The English translations of the tracks' Chinese titles are unofficial.
# Track Length Artist In-game use
1 急行
Allegro
02:20 PMP Music All LE operations except LE-8 and LE-EX-8
2 斜阳肃穆
Solemn Twilight
02:22 PMP Music LE-8 and LE-EX-8
3 夕照
Afterglow
02:45 PMP Music LE-8 and LE-EX-8: The first half is looped when Kreide, "Worldly Remains" becomes an ally; the second half is looped after it enters the second phase
4 光影
Licht und Schatten
02:06 PMP Music Lingering Echoes menu
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