Nagi no Asukara (also, "Nagi-Asu: A Lull in the Sea") is an anime by P.A. Works with a manga adaptation by Risou Maeda. It's a fantasy romance drama about an underwater village and its inhabitants.
Nagi no Asukara is an original anime by P.A. Works about five middle school friends: Sakishima Hikari, Mukaido Manaka, Hiradaira Chisaki, and Isaki Kaname who live in an undersea village, and Kihara Tsumugu who lives on land. The story tells their struggles to adjust to a new environment and the relationships between the sea and land people, while dealing with newfound feelings that have just appeared with the end of their childhood.
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