第1話: 2匹のカニの兄弟が、行方不明の父親を探すために危険な淡水の捕食者を回避する。

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Two crab brothers embark on a grand underwater adventure to find their father, after an accident carries him far downstream. Depicted as tiny beings in a large and merciless natural world, the brothers must evade a series of freshwater predators if they are ever to reunite with their family again. (Source: GKIDS)