Father, an anthropomorphic freshwater crab, lives with his family in a forest stream. When the mother temporarily leaves to give birth, he assumes guardianship of their two children. A fierce storm hurls him downstream as he shields them from churning waters, spurring the siblings to embark on a search. Their journey confronts them with hazards like a prowling predatory fish, thwarted only when a heron strikes, consuming the threat and reuniting the family. The mother later reappears with four newborn offspring. Eventually, the siblings depart to join peers of their age, hinting at an evolution in their family’s structure and responsibilities.