A sudden heavy rain caused a male student, Sakai, to be unable to return home from school. Reina, a female teacher, decides to let him stay at her house. She had planned to spend the day with her boyfriend, but she ends up fighting with him over letting Sakai stay at her house. Seeing Reina's sad expression and her huge breasts, soaked through by the rain, Sakai's admiration and sexual desire explodes, and he attacks Reina. Reina is conflicted about their positions as teacher and student, but she gradually accepts Sakai's sincerity and his feelings for her, and the two forget everything and devour each other like animals...