Misora, an ordinary office worker, has decided to live alone due to her mother's remarriage. She meets a handsome man named Okura at a major real estate agency, who shows her a property, but it is a room in an ultra-luxurious tower apartment! For some reason, Misora has to decide on a new place to live on the same day. Although she is suspicious, she is lured by the "30,000 yen/month" rent and inadvertently signs the contract. However, when she moves in, she is surprised to find that Okura is there! In fact, Okura is the president of a real estate company and a resident of this room! Moreover, the contract Misora signed is for a "pet-subordinate relationship" with Okura...?