In modern-day Paris, there's a teen junior high school girl named Marinette Dupain-Cheng and her classmate, Adrien. When evil arises, Marinette transforms into Ladybug while Adrien transforms into Cat Noir. However, neither know each other's secret identities. Together, they fight to protect Paris against the mysterious villain Hawk Moth.
Kanenone Academy was an all-boys high school isolated from the world by mountains and hills. Yusuke Takasaki, the average 11th grader, led a normal life in the academy until the academy announced attempting for co-ed, and high-school girls were being transferred for the summer semester.