Himari keeps a secret notebook filled with detailed romantic scenarios she imagines with a fictional childhood friend. When her real boyfriend discovers this and breaks up with her, she drowns her sorrows at a club. There, a handsome stranger picks up her dropped notebook, reads it with amusement, and makes an unexpected offer: he will role‑play as her imagined childhood friend and fulfill those fantasies. Himari agrees, and they begin a contractual relationship in which he acts out the scenes from her notebook, one by one.

As they proceed through the scenarios, what starts as a purely transactional arrangement slowly develops into genuine emotional intimacy. The man reveals his real name, Midori, and the story deepens when his own past and identity come to light—he is an actor with his own hidden reasons for taking on the pretend role. The two confront the truths they have been hiding from each other. After completing all the planned scenarios, they must decide whether the contract will end or whether their connection has become something real. The narrative reaches its climax when they openly face their feelings, leading to a resolution that ties together the nature of pretense, trust, and love.