Investigator Hikari and a junior colleague start staking out the mastermind behind a smuggling ring. After a week of sweaty abstinence in a closed room in midsummer when the air conditioner breaks down... The two of them reach their limits, and the tension breaks, and they cross the line. Even though they're on a mission, they lose themselves, sucking the steamy dick, and the two of them get entangled in a passionate embrace, mixing sweat and bodily fluids. Their relationship will end once the case is solved, but Hikari has learned how to have sex for real...