In this era of voluntary restraint on non-essential outings, 'Yuya,' who runs a used car dealership, finds it hard to go home because he meets with many people. His wife, 'Himari,' is stressed out from being cooped up at home without her husband and unable to go out much, while Yuya's stepson 'Atsushi' lives like a NEET. One day, Yuya has to go on a business trip to the neighboring prefecture, leaving his house empty for an extended period... Through a series of coincidences, the stepmother and son, who are close in age, end up confined in a locked room together for two months, wallowing in the scent of sweat, semen, and vaginal fluid as they indulge in each other's bodies like beasts.
