High schooler Natsuo is hopelessly in love with his cheerful and popular teacher, Hina. However, one day at a mixer, he meets a moody girl by the name of Rui and ends up sleeping with her. Soon after, his father announces that he's getting remarried to a woman with two daughters of her own. And who shows up in tow, other than both Hina and Rui?! Natsuo's outrageous new life starts now!
Heartbroken after being rejected by Hina, Natsuo finds himself at the home of the promiscuous Momo Kashiwabara. In order to forget about Hina, Natsuo has decided to go out with Momo. As soon as the get inside, Momo pounces on Natsuo, and they head for the bedroom... Could this be the start of a new love for Natsuo?!