Koi hi Kogaruru Kamikakushi

Memories and recollections are irreplaceable. ━ Even if they are painful. Tetsuya Kai sneaks into school at night to pick up a forgotten item and is suddenly attacked by an unidentified monster. In his desperate situation, he is saved by his classmate Tomomi Soshi. Tetsuya joins Tomomi's occult research club by chance, and he pursues the mystery surrounding the "Shikigami" that attacked him and saved him.