Riga (Harada Shiroshi) and Kengo (Takuhiro Watanabe) are a couple who have lived together for four years. In the case of Riga, without warning, Jianwu is deeply in love with another girl, Hanako (Miho Kanno). Riga, who was suspicious, only wanted to stay in the house where they lived together and wait for Jianwu to turn around, but the passionate Huazi broke into Rijia's life circle. At first, Riga had no affection for this rival who was completely different from her, but she gradually became concerned about her unwittingly. How can the inexplicable triangular relationship find an outlet?