Suspenseful piano and moody strings that unfold like a detective novel set in Gensokyo. Gensou Mangekyou Hana no Ihen is a 2019 Windows Touhou fan visual novel, and the music plays the mystery straight. "迫り来る白傘" (Approaching White Umbrella) builds dread with careful restraint, "逆襲" (Counterattack) snaps into sharp urgency, and "閻魔様の視線" (The Enma's Gaze) has this judgmental weight that genuinely unsettles.
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The detective thread is strong. "迷探偵射命丸" (Bumbling Detective Aya) lightens the mood just enough, while "新たな犠牲者" (A New Victim) drags it right back down. Multiple versions of the OP, ED, and key themes show real production care.
Full versions reward you for finishing. If you want a Touhou soundtrack that trades danmaku for crime scenes and still delivers, this is the one.