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 that day with her boyfriend, but she ended up fighting with him because she gave Sakai to her house. Seeing Reina's sad expression and huge breasts wet from the rain, Sakai's admiration for her and her sexual desire explode and he attacks Reina. Reina is conflicted because she is her teacher and her student, but she gradually accepts Sakai's sincerity and her feelings for him, and the two forget everything and devour each other like beasts.
