16-year-old super-studier Nagi Umino, second-year student at the Meguro River 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! With his childhood crush Ai-chan back in town, Nagi finds himself caught in a love...pentagon?! And he's about to learn her shocking secret at the summer festival held at Hiro's family temple... Meanwhile, Sachi is going on a date?! The war for Nagi's heart rages on!