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!
At long last, Nagi and Hiro have finally started dating each other! Their first date resembles that first rainy day…but before long, Erika drags Nagi off to Okinawa?! Seeing Erika looking like a princess makes Nagi excited, and the arrival on the scene of Rihito, Erika’s childhood friend and fellow hotel heir, makes him feel even more conflicted… And what’s that about a proposal?! The storm of love has begun to rage in Okinawa!!