Mark (stage name Glen Belt), is struggling to write a hit single. But his lyrics are awful and he can’t think of a chorus. His self-run fan website has received no visitors. But Keiko, a musical prodigy in Tokyo, stumbles on the site, falls in love with him and sends him a chorus. Mark tells Keiko to get lost, takes the chorus, posts it on the site and sinks into a depression. He surfaces a week later to find the song is a massive hit, but he isn't prepared for the fame he's always craved.