La Folia's sudden engagement declaration hits like a plot bomb because it forces Kojou to defend something he never agreed to, turning every fight into a negotiation he's already lost. Lucas is the kind of antagonist who makes perfect sense, he's not wrong to doubt some random high schooler, which means watching Kojou earn his respect becomes the actual story instead of just another power-flex. The OVA knows exactly what it is: two episodes of escalating chaos held together by a girl who decided her future before anyone else got a vote.
La Folia ambushes Kojou and Yukina on their way to school with unexpected news: she's chosen him as her future husband. Her father Lucas won't hear it, but her mother Polifonia sees an opportunity to sort things out properly. She extends invitations to a formal party where both families can discuss the matter like civilized people. The catch: Polifonia also invites everyone connected to Kojou, which means Asagi, Yaze, Nagisa, and Sayaka all show up. What was supposed to be a diplomatic dinner quickly spirals into chaos as the girls realize exactly what's being discussed. Jealousy, territorial claims, and old rivalries surface as La Folia pushes her engagement agenda while the others defend their own stakes in Kojou's life. Between La Folia's stubborn royal confidence, her father's violent objections, and the mounting tension between the gathered women, the party transforms into something far more explosive than anyone bargained for. Political intrigue collides with romantic warfare, and Kojou finds himself caught in the eye of the storm.