Yaku is an adventurous little girl with a deep bond to the sea, whose best friend is Gavi, a seagull she plays with every day. But when a catastrophic oil spill threatens the livelihood of her family and artisanal fishing community, Yaku must summon all her courage to protect her feathered companion and the other animals she loves. As the thick black liquid spreads across the sea and its shores, Yaku faces a desperate struggle to save her world and the creatures that live within it.