Nanami is a newlywed living with her mother-in-law. Her busy husband is tired late at night. While she and her husband are alone in the living room, a sudden thunderclap causes the power to go out, and her husband gets up to check the distribution board. Nanami is alone and frightened when her mother-in-law comes and starts to fondle her body. Unable to resist, she ends up giving him a blow job. Taking advantage of the power outage, her mother-in-law tampers with the distribution board. Nanami is alone and frightened in her bedroom, and her mother-in-law begs her to have sex with her just once, so she allows it. The next day, the power is still not restored... and even though her husband is sleeping next to her, her mother-in-law keeps coming on to her. Then, when the repairman arrives in the afternoon, Nanami is approached and begins to feel aroused, knowing that this will be the last time.