Nanase just wants to be loved, but her menacing facial expressions and steely eyes make it difficult for people to approach her. But when one of her classmates confesses to liking her in spite of her peculiar mannerisms, all that's left is to make things official with some good old sex.
But seriously, this is a very heartwarming story in my opinion. Very fluffy. Hope we'll see them again in the future. Maybe on a sequel.