Due to a sudden downpour, female teacher Rena decides to let her student, Saki, stay over at her place since he can't return home. However, this leads to an argument with her boyfriend as she had planned to spend the day with him. Witnessing Rena's forlorn expression and her rain-soaked, voluptuous breasts, Saki's admiration and lust reach a boiling point, causing him to pounce on her. Though initially conflicted by their teacher-student dynamic, Rena gradually succumbs to Saki's sincerity and affection, and they abandon all inhibitions, embracing each other like wild beasts, consumed by their primal desires.