A year after being transferred from a technical position to the sales department, Akihito Kanō, who is poor at expressing himself, struggles to fit in and spends lonely days. His relationship with his colleague and the sales department’s ace, Seiji Ōkami, had soured due to a certain incident. One night under a full moon, Akihito discovers an old mirror at a shrine and wishes, “I want to become someone who can smile as an equal with Ōkami.” Suddenly, a thick fog appears, and Akihito finds himself lost in a parallel world—one where his “ideal self” lives.