Can men and women really stay just friends after they have slept together? His adorable old classmate is hopelessly in love and determined to have him whenever the mood strikes. She hides under the kotatsu, inside cardboard boxes, in the closet, beneath the bed and even in the bathroom, springing out whenever he drops his guard. Each time she promises she will leave after one round, then demands a second and a third. There is nowhere to hide from this insatiable friend who has turned his own home into a nonstop surprise-sex trap.