Summer, 1989. Eisuke begins to record a new radio drama in the school studio by himself. Then, an unknown girl who attends classes at night starts recording her own parts as a character without his permission. Eisuke decides to let her participate and keeps the radio drama going, relay-style, with a person whose name or face he doesn't know. Day and night, two strangers who never would have met otherwise record a story together on a cassette tape.