The cool Mihara Satoshi, who is both intelligent and sexy, finally has her first ever black man fuck! The travel-loving couple Maihara, who have been married for five years, are on a trip to a guesthouse. As they take a rest, enjoying the charming atmosphere and savoring their time alone together, a black male tourist appears from the room next door, separated by a sliding door, and cheerfully greets him. In contrast to her flustered husband, Sei gets Sei with the black man, but gradually she can't contain her Kokoro about his big crotch...