Following the tragic loss of his sister, Ryousuke's family falls apart, prompting him to flee his home. His escape leads him to Nijigahara, a peculiar realm where time stands still and everyone remains a child. As Ryousuke grapples with the consequences of his arrival in this enchanting haven, the pressing question looms: can his presence shatter the illusion of this paradise, and will he ever find his way back to reality?