Sister run out of cry for the moon

Musashi lives with his older sisters Nanami and Misaki, who often take advantage of him. His cousins Kazuha and Honoka live next door, blurring the line between family and something more intimate. Every day is full of happiness, but the delicate balance shatters when all four girls confess they have loved him since birth and ask him to marry them.

Suddenly, each girl aims to claim Musashi as her own. The siblings and cousins compete for his attention, turning their once peaceful daily life into a chaotic struggle. Musashi must navigate their conflicting desires while maintaining the bonds that tie them together.