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!
With entrance exams finally over, Natsuo officially becomes a college student. Now living on his own for the first time, a world of change awaits him. New friends, new experiences, and new challenges. Meanwhile, Hina moves back home. With so many intertangling elements, the chaos is sure to continue!