Opens with a Dixieland jazz rearrangement of the main theme, which is a choice you have to respect. The gacha RPG genre rarely swings this hard. Lesson Time is peppy and school-life bright, but Sennen no Hiai (Thousand Years of Sorrow) pivots into something genuinely orchestral and heavy, the kind of melancholy that doesn't belong in a mobile game but here it is.
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Kakegare! Tenku no Kairo races upward with urgent brass and strings. Datenshi no Kodou brings dark angelic energy, pulsing and ominous. Zetsubou wo Koete pushes past despair into something triumphant. The bonus tracks reorchestrate earlier pieces with fuller arrangements that hit different.
For a mobile OST sequel, this has no business going this hard.