16-year-old super-studier Nagi Umino, second-year student at the Megurogawa Academy high school, was switched at birth. On his way to a dinner to meet his birth parents, he accidentally meets the brash, outspoken, Erika Amano, who is determined to make Nagi her fake boyfriend as she never wants to actually marry. But once Nagi makes it to dinner, he finds his parents have decided to resolve the hospital switch by conveniently having him marry the daughter his birth parents raised...who turns out to be none other than Erika herself!

The Megurogawa Academy culture festival has begun! Amidst their nervousness for the M-1 competition, Nagi and Erika walk around the school together. If they lose, their cohabitation will end... What's the “bomb” they’ve prepared to ensure their victory?! What is Soichiro planning?! And what's the answer that Nagi has reached?!