Pure shmup energy running on overdrive. SevenTailsButterfly is a doujin shooter for PC and its soundtrack alternates between soaring stage themes and absolute chaos boss tracks with zero breathing room between them. スティグマの翼 (Stigma Wings) on stage 1 sets this melodic tone that Deathmatch immediately demolishes with aggressive layering.
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The real standout pair is stage 6's Phantomscape drifting into ジェノサイドバロック, which is exactly as unhinged as its name implies. Boss 7's waltz of noble destruction goes baroque in the most literal way possible. Then Butterfly closes things out and actually makes you feel something.
The continue screen track is called おやすみなさい (goodnight) which is honestly kind of cruel. Shmup fans who love Touhou-style arranged music need to hear this one.