Kakkoyoku No Yome Vol. 12 — Manga Raw / Buy Official

The school festival acts as a catalyst, tearing down the protective walls of their private cohabitation. In this volume, Erika is forced to redefine her 'fiancée' label as Nagi’s unwavering devotion pushes her into a corner. Within the confined space of their classroom preparations, Erika finally acknowledges that her rapid heartbeat is not mere dependency, but honest romantic love. However, the situation complicates as other forces circling Nagi threaten their precarious balance. Nagi, breaking free from the shackles of their blood-switched past, decides to face Erika as a man rather than a brother figure. As the fireworks roar at the festival’s climax, the distance between them vanishes entirely. This is not just a simple confession; it is a total collapse of their old dynamic, paving the way for a future they choose together. Erika’s mature expression in the final scene serves as definitive proof that she has evolved beyond the 'rich girl' persona, setting her sights firmly on a life with Nagi.