When Hotaru's husband suddenly collapses from a seizure, her distraught wife is approached by her neighbor, Hirai, who happens to be passing by. Hirai administers appropriate treatment and her husband survives. This leads to a relationship between them, but... Hirai, a student preparing for his entrance exams, sees Hotaru as a sexual outlet and takes advantage of the situation to close the gap between them. He takes advantage of her kindness and forcefully pushes her down... Although he forced her, Hotaru is confused by the pleasure that resonates deep inside her body. Even though Kokoro rejects Hirai, her body craves his penis...