Kakkou no Iinazuke

Born into the wrong family due to an accidental hospital mix-up, Nagi Umino has spent his life navigating the peculiar circumstances of his birth. Despite the revelation that he is not biologically related to the parents who raised him, he has carved out a diligent existence as a student at a prestigious private high school, determined to make his own way. His carefully ordered routine, however, is upended in a single, chance encounter with Erika Amano—a dazzling, ultra-wealthy heiress whose demeanor is as imperious as her social standing is elevated. When Erika abruptly commandeers Nagi to pose as her fake boyfriend on her way to what she claims is a meeting with her betrothed, he finds himself swept into a whirlwind of her eccentric demands and unyielding confidence. What begins as an absurd, temporary charade carries a weight neither of them comprehends in that moment. The strings of fate have twisted far more intricately than either could imagine: Erika is, in fact, the very girl Nagi was switched with at birth, and the fiancé she is on her way to meet is none other than Nagi himself. As the shocking truth slowly unravels, their accidental alliance transforms into a tangled web of familial expectations, identity crises, and the undeniable pull of a bond forged not by blood, but by the sheer chaos of destiny.