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 diving into Natsuo's bed, Miyabi awaits his return. However, when Natsuo comes home, it's with Rui in tow! Keeping quiet, she ends up hearing an important conversation! Is there no end to this complex web of love triangles?!"