As Koyuki strums and picks the guitar that Ryusuke has given him, Maho suggests that Koyuki step into the spotlight and become a singer in Ryusuke's band. And with a Battle of the Bands festival on the horizon, he finds the perfect venue in which to perform—he ends up joining a Beatles cover band that is playing in the competition. But Koyuki's nerves suddenly jump up an octave when he discovers what is really at stake in the contest. But it's probably nothing that a steamy skinny-dipping session won't cure—Maho tags along for the festival, and you can be sure that girls just want to have fun!