Taku, a second-year university student living at home, leads a carefree life without the burden of rent. But recently, a new kind of tension has entered his days — one that begins with his older sister, who has returned to the family home after giving birth to her second child. Once a wild punk, she's now a devoted mother, yet there's a new allure in her presence, a kind of mature charm that Taku can't ignore.
Their relationship has always been playful, even a little chaotic — but now, with the household dynamics shifting, the familiar sibling banter turns into something more intimate. Taku can't help but notice how his sister's body has changed, how her presence feels more inviting than ever before. It's not just the milk she gives him, or the moments they share in private — it's the way she looks at him, the way she teases him, and the way she lets him in, even when she's not entirely sure what she's letting in.
As the days pass, their interactions grow more frequent, more personal. Taku finds himself drawn to her in a way he never expected — and she, too, seems to be aware of the shift in their connection. Between the playful teasing, the late-night conversations, and the moments of quiet intimacy, their bond deepens in ways neither of them anticipated.
But the family isn't without its own distractions. Taku's mother is always there, watching, teasing, and sometimes even joining in the fun. And then there's the rest of the family — the brother, the father, the mother — all of them part of this ever-growing, ever-changing dynamic. Yet, through it all, Taku and his sister remain the heart of this story, their connection growing with every passing day, every shared moment, and every secret they keep from the rest of the household.
