Set ten years after the anime, the fic opens with Nagasumi and Sun's long-awaited wedding; Nagasumi has finally won Gozaburo's respect, as well as Maki's, but shortly after the wedding, the newlyweds reveal that the two had consummated their relationship shortly before, and that Sun is pregnant. On top of it all, Sun is shortly after targeted by Tiger-Shark Tony, a former member of the Seto Gang out for revenge on Gozaburo.
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My Bride is a Mermaid: Wedding Bells contains examples of the following tropes:
- Even Evil Has Standards: Gozaburo and Ren may be yakuza, but even they find Tiger Shark Tony to be nothing but an ruthless bastard, partially because he tried to usurp control of the Seto Gang from Gozaburo by kidnapping Sun, then a one-year-old baby, and threatening to kill her.
- Pregnant Hostage: Sun is heavily pregnant when Tony kidnaps her.
- Screw the Rules, I Make Them!: In chapters 3 and 4, upon finding out about Nagasumi's association with the Seto Gang, Mawari's immediate reaction is to go straight to Nagasumi and Sun's house and try to arrest them. However, after sitting down with them and talking things out, Mawari decides to let them go since she was technically off-duty anyway.