A strange girl Takuma meets. She calls herself “Otoha, The Spirit of Time’s Sound,” and acts as if she is guiding him. But the truth is that only Takuma can feel her presence.
[Otoha appears to be a normal girl, but she is in fact a spirit, and only Takuma can hear or see her. She is always cheerful, and will appear out of no where, clinging suddenly to Takuma. She refers to herself with the masculine pronoun boku (僕?), meaning "I". She refers to Takuma as the "Promised Person" (約束の人, Yakusoku no Hito?). It is revealed that Otoha is the real Hinata Kagura who fell into a river and drowned. She took the name Otoha from Hotaru's picture book that she drew herself. Otoha shows Takuma a strange world before disappearing, in this world she is his fiancé. Just before she disappears, she confesses her love for him but says that she is not the one he belongs with.