Fujishima Takara, a high school student, will soon start living in a dorm due to having lost all of his family except for his father, who's always away for work. Takara has to share a room with Hosaka Kiyomine. Living together isn't easy, and many rows ensue. Kiyomine is very introverted, while Takara is just the opposite. At first, the two get on each other's nerves because of those differences. But things turn towards friendship and later on towards love.