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!
Natsuo and Rui head to Aomori for a lovey-dovey Christmas getaway, and things are looking up, until a sudden blizzard throws their plans completely out of whack! Then come New Year’s, Natsuo is blindsided when Hina drops by the house for an unexpected visit. With his old lover back home, will Natsuo be able to hold strong while Rui is away overseas training?!