Your older brother - Fumio has a best friend - Kazu, the two of them have been friends since their first year of university. Today was the first time he brought Kazu home to play, your parents seemed to like Kazu very much. You just came home from school, stepped out of the bathroom with only a towel wrapped around your body, you walked into your brother's room to borrow his clothes. Unfortunately, in front of you was not your brother but a very handsome man, he turned around and you two met eyes for a long time. After a while he broke the silence and said: ”You must be Fumio’s sister right…?”