One Touhou arrange track, four different versions, all built on the same source. Kappa Nitori's Summer Vacation is a 2007 Windows doujin game starring Nitori Kawashiro, and every single track is a remix of "Akutagawa Ryuunosuke no Kappa ~ Candid Friend."
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Four takes on the same melody. Each version reinterprets the theme differently. Some lean into the playful river-kappa energy, others push the arrangement into more intense territory. Same bones, different skin every time.
It's a very doujin-game move. Take one iconic ZUN composition and build an entire short game's soundtrack out of variations. Minimal but committed. For Touhou fans who want to hear how far one theme can stretch before it breaks, this is a fun experiment.