I don't remember inviting you, though.Subliminal memories...
A scientific form of mesmerism.You're the host of this party, huh?When you found out about the man-eating wolf in the mountains, you had the idea of adding a little extra.You used that brainwashing disk and fake scrolls to drive Akyuu into confusion.You put together Amu's nonexistent murder case.A tiny signal we could only hear as noise..."Kill Reimu", huh.With the record's brainwashing sound, you planted that urge in her subconscious.The fake scrolls from Kosuzu helped complement Akyuu's surface memories.But that would remain in the subconscious of Akyuu, who never forgets anything she's heard, and become an obsession.