At the end of summer, during a lunch break, I swapped bodies with a stranger from a parallel universe. My name is Zuo Yu, a senior high school student enjoying the typical high school life of going out five days and returning eleven, living a colorful youth amidst the stark contrast of exam papers. The person I swapped bodies with is Yukino Yukinoshita, a freshman high school student living a typical high school life, her presence absent from the vibrant high school world. Originally from parallel universes, leading parallel lives that would never intersect, our bodies were swapped, bringing us together.