Yasunori Tada fell in love with Rio Arikawa during their days at university. Now, Arikawa is a famous announcer and Tada is a lowly assistant director – a position he took in order to get close to the girl of his dreams. After a heated encounter, Arikawa informs Yasunori that they made an important promise to one another, but unfortunately, he does not remember it. Yasunori becomes determined to remember that promise.