My Bride is a Mermaid

In the picturesque town of Seto, Nagasumi's summer vacation takes an unexpected turn when he's saved from drowning by a mysterious mermaid named Sun. But their chance encounter comes with a catch - Sun's family, the heads of a mermaid Yakuza group, must execute either Nagasumi or Sun to keep their secret under wraps. In a desperate bid to protect their lives, Sun's family proposes a solution: Nagasumi and Sun must marry. As they navigate their new life together, they face a series of challenges from Sun's disapproving father and a cast of colorful antagonists, all while keeping their secret safe from prying eyes.

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Some TV shows that have similar genres and were produced around the same time as My Bride is a Mermaid include Dragon Ball DAIMA, My Isekai Life: I Gained a Second Character Class and Became the Strongest Sage in the World!, From Old Country Bumpkin to Master Swordsman, Disenchantment, DreamWorks Dragons, Cautious Hero: The Hero Is Overpowered but Overly Cautious.