After his mother and father exceeded away a few years ago, Yuuji Enomoto become followed into the own circle of relatives of his formative years pals Yuna and Nina Tsubakihara and their mom Mira. Now in excessive faculty and called Yuuji Tsubakihara, he lives below the equal roof as a couple of adorable twins and a lovely older woman. Although the shy, reserved Yuna and the outgoing, proficient Nina are his own circle of relatives, Yuuji submits to his goals after witnessing Yuna flip down a confession. But as Yuuji and Yuna sooner or later consummate their lifelong love, can Nina and Mira stand idly by?