Following his sister's demise, Ryousuke's folks split apart. Overwhelmed by helplessness, Ryousuke flees his abode and ends up on the other end of the rainbow in Nijigahara, a location devoid of the passing of time, where every inhabitant is a child. Nonetheless, with Ryousuke's arrival in the apparent utopia, will the fantasy realm crumble, and will Ryousuke ever return home?