Children Of The Sea, Volume 1 by Daisuke Igarashi

In this captivating manga, a young girl named Ruka finds herself drawn to the ocean's mysteries after a chance encounter with two enigmatic boys, Umi and Sora, who were raised by dugongs. As Ruka delves deeper into their world, she discovers a connection between the boys and a series of strange occurrences involving marine life. The story weaves together themes of environmentalism, the supernatural, and the bonds that tie humans to nature, all set against the backdrop of the vast and mysterious sea.

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