わだつみの嫁取り(Wadatsumi no Yometori)

Plot

A man, Kiyo, is mistaken for a woman and taken as a bride by an immortal mermaid, who says that if you become a couple with a mermaid, you will become immortal. The mermaid's power has made him incapable of dying, and he spends the rest of his life together with her, despite his worries. On the other hand, the mermaid loves Kiyo deeply, but he has a secret...? This is a fantasy tale of pure love that transcends races, spun by the talented Yayohi Bunzen, whose "Zhen Zhen" has been the talk of the town. Includes new comics illustrations!