After finally getting his own place for college, a man expects uninterrupted time alone, but his friend Kiho—who already has a boyfriend—starts staying over every night. Her relaxed smile, revealing sleepwear, and casual touching keep him painfully aroused, yet he lacks the courage to act. When she catches him masturbating beside her late at night, impulse takes over; they have sex, skip school to do it repeatedly, and when she asks to stay again, he can no longer say no.