Kajitsu, Taro, Natsu and Satsuki have nothing in common except each other. Abandoned by their parents, these foster-siblings have forged a family of their own. But life in a house without grown-ups isn't as ideal as it sounds. As kids, Kajitsu and Natsu were once the best of friends. Now that they've rebuilt that friendship as teenagers, will the feelings they have for each other cross the line into romance? Passions rise as the bonds that brought these kids together threaten to tear the new family apart.