Nao is a female teacher and colleague who is engaged to be married next spring. She was living a normal, peaceful school life until one day, a student unexpectedly witnessed her getting intimate with someone on campus. The student uses this incident as leverage, demanding a physical relationship with Nao. In the sweltering heat of the summer school building, Nao finds herself complying despite being drenched in sweat. Gradually, her resistance fades as her emotions intensify, leading her into overwhelming pleasure.