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!
After Natsuo loses consciousness defending Hina from Tanabe's knife attack, his surroundings begin to undergo major changes. Hina hardens her resolve, Rui arrives at a decision, and Miyabi recognizes her own feelings. Just as his love life was settling down, Natsuo finds himself embroiled in a three-way struggle for his affections!"