Aunt Mari, the manager of the boarding house where we sleep, has been protecting this boarding house on her own, since her husband was lost before her. I don't have any particular hobbies, but I'm working part-time at a lingerie online store and this underwear is really sexy. It's so sexy, so when Aunt Mari starts trying on, we secretly peek at her and make a bet on the colour of her underwear. One day, the lodger, Isejima, was questioned and confessed in a flash. Ah, what will our fun be?