Naotatsu Kumazawa is set to start high school. To commute to school, Naotatsu Kumazawa will stay with his uncle, Shigemichi Utagawa’s. On a heavily rainy day, Naotatsu Kumazawa arrives at the nearest stop from his uncle's house. At that time, a strange adult female, Chisa Sakaki, is waiting for him at the station. She takes him to a sharehouse. Naotatsu Kumazawa begins to live with other people at the share house including Chisa Sakaki, his uncle Shigemichi Utagawa, Hayate Izumiya and Kenzo Naruse. All the people there come from different backgrounds. Chisa Sakaki is a 26-year-old OL. Shigemichi Utagawa is a manga writer, but his parents don't know that he quit his regular job to become a manga writer. Hayate Izumiya is a fortune-teller and dresses in women’s clothes. Kenzo Naruse is a university professor who travels all around the world. Living with them, Naotatsu Kumazawa becomes to have feelings for Chisa Sakaki, but Chisa Sakaki says she doesn’t want a romantic relationship. Naotatsu Kumazawa and Chisa Sakaki had an unexpected connection in their past. What is the reason why Chisa Sakaki doesn’t want to have a romantic relationship?