Young Coben on his sixteenth birthday discovers that has long been engaged with the boys of the same age. His name Mitsumine Haku,and he moved from the countryside and settles into her house. In addition, he Neznamov what took with him his little sister, who still studying in elementary school. Considering that to this fun yet eighteen joins older sister young once tranquil home almost flipped upside down.Will these four get along? And it does not frustrate the engagement of the difficulties of living together? In any case, it is better now than after the wedding!