This is a show that knows exactly what it came to do and doesn't waste a single one of its eight minutes apologizing for it. The premise, a girl announces she's your wife and the student council just accepts it, gives the show permission to skip past all the usual romantic comedy buildup and go straight to the dynamic where she's already embedded in his life, which changes everything about how the jokes land. The ecchi bits aren't flourishes on top of character moments; they're the actual structure, and the show respects you enough not to pretend otherwise.
Izumi Hayato's student council ambitions crash and burn when a charismatic rival steamrolls her way to presidency with promises of romantic freedom. Stuck as vice president, Izumi figures that's the end of it. Then she shows up at his house uninvited, drops a bombshell: their parents made a drunken agreement years ago that she'd become his wife. Izumi has no memory of this. Neither does she, really, but she's committed to making it happen anyway. What follows is pure comedic chaos as this self-proclaimed future wife inserts herself into every corner of Izumi's life. She's shameless, pushy, and weirdly endearing despite being absolutely insufferable. The student council becomes her playground for increasingly ridiculous schemes, all while Izumi oscillates between exasperation and reluctant attraction. The show runs on absurdist humor and constant escalation, built on the dynamic between a guy who just wants normalcy and a girl treating marriage like it's a personal project she's determined to complete.