In a world where a pandemic has left most men unable to function normally, Kazuki discovers he alone remains unaffected. Fearing exposure would turn him into a lifelong test subject, he transfers to an all-female academy in hopes of blending in and guarding his secret. Upon arrival, he meets a welcoming senior, an irritable teacher, the admired school idol, and a wealthy heiress, each quickly drawn to his presence. As these new relationships form, Kazuki realizes maintaining his privacy will require careful choices amid growing attention.