Next door to the Mizuhara couple, who live a peaceful life in their company dormitory, a new male resident named Oki moves in. One day, laundry gets caught on the balcony, and wife Rinka calls over to the neighboring room. Impressed by his demeanor, Rinka begins treating Oki kindly. However, Oki becomes deeply infatuated with Rinka's warmth. Despite her husband being right next door, he can no longer suppress his desire and forcefully pins her down. Rinka experiences an intensely sweet, tingling ache throughout her body during their passionate sex. Their ordinary neighborly relationship instantly transforms into something far more dangerous.