Tropic Of The Sea by Satoshi Kon

Set in a small coastal town, the story revolves around a family that has been tasked with protecting a sacred mermaid's egg for generations. As modern development threatens the town's traditional way of life, the family faces a moral dilemma between preserving their heritage and succumbing to the pressures of progress. The narrative explores themes of environmental conservation, tradition versus modernity, and the deep connection between humans and nature, all while unraveling a mystical tale that challenges the characters' beliefs and values.

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