"I will show you an illusion—" Kasumi Hana visits Urushizawa Riri, the pen pal of her deceased brother, to inform her of his passing. If she had deceived her brother, Hana intended to kill her. However, Riri was a blind girl who genuinely loved Hana's brother. For Riri's sake, and to atone for her own sins, Hana resolves to take her brother's place.