Nanami, who lives with her mother-in-law after getting married, has a busy husband who comes home late and tired every night. While they are together in the living room, a sudden clap of thunder causes a power outage, and her husband gets up to check the circuit breaker. Her mother-in-law approaches Nanami, who is alone and frightened, and starts touching her body. Unable to resist, she ends up performing oral sex. Taking advantage of the power outage, her mother-in-law tampered with the circuit breaker. Alone in the bedroom, frightened Nanami is begged by her mother-in-law for just this once... and reluctantly agrees to have sex. The next day, the power is still not restored… even as her husband sleeps beside her, her mother-in-law approaches. When the repairman comes during the day, Nanami, who is being pressured, actively feels that 'this is the last time.'
