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!
Stranded in the mountains during a storm, Natsuo and Hina must now spend the night together all alone. Despite knowing full well that he’s her little sister’s boyfriend, Hina just can’t seem to let go of her feelings for Natsuo.Torn and confused, who appears before Hina, but the man her mother offered to set her up with. Meanwhile, Rui and Natsuo’s relationship takes a drastic new turn! On top of that, a love triangle surrounding Natsuo forms within Forester?! The whirlwind of relationships rages on! Also includes 2 special bonus chapters (an extra 32 pages of content)!