Yusuke Takasaki has spent his entire high school years in blissful isolation at Kanenone Academy, an all-boys institution nestled deep in the mountains. His unremarkable routine suddenly shatters when the school makes a shocking announcement: female students will be arriving for the summer semester as part of a pilot co-ed program. What begins as nervous anticipation quickly spirals into comedic chaos. Yusuke and his friends scramble to adjust to the presence of girls after years of male-only existence, leading to awkward encounters, misunderstandings, and plenty of embarrassing moments. The girls themselves bring their own brand of disruption to the peaceful campus, and romantic tensions simmer beneath the surface as connections form. Between the clash of two isolated worlds colliding and the natural attraction blooming between students, the summer semester becomes anything but ordinary. Yusuke finds himself caught in a whirlwind of new feelings and unexpected relationships while navigating the comedic minefield of suddenly coeducational life.