Shiki-san Chi

Natsuki, Soushuu, and Touma are three brothers who share a home and spend their days drifting through an uneventful, monotonous routine. Without much to disrupt the quiet rhythm of their lives, the siblings have settled into a predictable existence where every day feels exactly like the last. Their mundane household dynamic, however, is entirely dependent on the absence of anything unexpected—a fragile stability that is about to be permanently altered. The turning point arrives when their mother returns home for the first time in quite a while. Rather than simply visiting, she brings along a surprise that none of the brothers could have ever anticipated: a new, significantly younger sister named Haruka. Her sudden introduction into their quiet household shatters the familiar boredom they had grown accustomed to, forcing the three brothers to adapt to an entirely unfamiliar family dynamic. With Haruka now under their roof, the brothers must navigate the challenges and adjustments of caring for a much younger sibling, leaving them to wonder how this unexpected addition will reshape their once-ordinary daily lives.