Shy and introverted little alpaca Sansan arrives at a new place to live, where she meets Biscuit Fish—an alien creature who doesn’t take anything to heart—and Crab Mama, a hermit crab with a fragile interior hidden behind a fierce exterior. A group of friends step out of their seemingly comfortable shells, and while searching for themselves, they encounter more companions, finding countless moments of warmth in ordinary daily life. A "shooting star" shifts a long-stagnant worldline, opening a new "problematic" story.