The absurdist core, swapped at birth, accidentally pretending to be each other's boyfriend and girlfriend, then discovering you were engaged the whole time, never stops being funny because the show refuses to resolve it. Comedy comes from watching two people trapped in a premise that keeps getting worse before anyone can explain anything. Nagi and Erika's chemistry survives the fact that the show barely moves their actual relationship forward, which is the real magic here.
Umino Nagi's life flips upside down when he discovers he was switched at birth. The reunion with his biological parents should be straightforward, except he collides with Amano Erika, a spirited girl from an elite academy who needs a fake boyfriend to dodge an unwanted engagement. Their impromptu scheme unravels instantly when both families reveal the truth: Nagi and Erika are the ones who were mixed up as infants. They're each other's intended spouse. With their parents overjoyed and engagement officially sealed, the two are forced to live together. But there's a catch. Nagi harbors genuine feelings for his classmate Segawa Hiro, while Erika refuses to let her domineering father control her love life. They strike a deal: coexist peacefully but stay emotionally distant. Romance is off the table. What follows is a delicate balance of proximity and avoidance. Erika's rebellious streak clashes with Nagi's earnest nature. Stolen glances compete with stubborn resistance. The arrangement spirals into comedic chaos as their household becomes ground zero for romantic tension neither of them planned for.