A female teacher, Reina, decides to let Sakai, a male student, stay at her house after he is unable to return home from school due to a sudden heavy rain. She was planning to spend the day with her boyfriend, but she ended up fighting with him because she gave Sakai home. Seeing Reina's sad expression and her huge breasts wet from the rain, Sakai explodes with admiration and sexual desire and attacks Reina. Rena struggles with her position 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 beasts.