Description：Nagasato Daisuke (played by Shingo Katori), who is nearly forty years old, works in a stationery company in Tokyo. He took out a loan and finally bought his own house in a high-end apartment in the center of the downtown area. With many elegant hobbies, he is committed to turning this place into his own castle. He does not want to accept his estranged father, not to mention annoying love and noisy colleagues. Contrary to his wishes, upstairs lives Kumagai Yenako (played by Juri Ueno), a fashionable single woman from a certain company. Yenako, who often gives suggestions on Nagasato's products, is destined to have a bad relationship with this neighbor. To make matters worse, Nagasato's father Yozo (played by Toshiyuki Nishida) actually moved in with the son of his second wife. The dream castle collapsed, and Nagasato had to get along with the "invaders" awkwardly in anger. Can he take back what belongs to him?