Akira Uehara volunteers to deliver homework to Nanako Momoi, his classmate and crush. At Nanako's home, her grandfather's invention causes Akira and Nanako to exchange bodies; the invention is destroyed shortly after its use. Nanako is thrilled with the exchange as it complements her tomboy personality; she begins dating her friend Makoto Shiina. Meanwhile, Akira's effeminate personality combined with Nanako's beauty garners the courtship of his friend, Shinnosuke Senbongi, to his discomfort.