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!
At the peak of his intensifying feelings, Rui finally kisses Natsuo. Meanwhile, as she takes life day by day in a new land, Hina finds herself unable to get over Natsuo. As emotions clash and the trio’s web of love grows more entangled, a chance encounter threatens to shake things up even further!