The Anime Lad
Nagasumi nearly drowns during summer vacation and is rescued by San, a mermaid. Her yakuza family follows a strict law about humans seeing their kind. Marriage offers a way to bring Nagasumi into the family and protect San’s secret. An ordinary vacation has therefore become an engagement supervised by aquatic organized crime.
Super Eyepatch Fox
San saves Nagasumi from drowning, but the rescue exposes her mermaid identity to a human. Her yakuza family’s law leaves marriage as the available solution. Nagasumi suddenly has a fiancée and a dangerous new family while still trying to keep San’s secret. The premise turns romantic comedy into a clash between school life and mermaid clan rules.
Gigguku
Nagasumi gets rescued by a mermaid and barely has time to breathe before her yakuza family turns the secret into a marriage negotiation! San and Nagasumi are suddenly engaged while the entire clan brings aquatic crime logic into the arrangement. Every attempt at ordinary romance now has to survive rules nobody on land would consider normal.
Father's Basement
The volume is exhausting, and the series makes its central joke obvious immediately. The premise can sustain the noise. San’s rescue exposes her secret, her yakuza family has a strict law, and marriage becomes the way to bring Nagasumi inside it. That arrangement keeps romance, secrecy, and clan pressure in the same room.
