Twin sisters Maiko and Maako are students at Takamune Academy, having recently transitioned from single-sex middle schools to a coeducational high school. Their enthusiasm for this new environment is soon challenged by Atsumu Shido, a known troublemaker. Shido frequently instigates conflicts with the sisters, particularly clashing with Maiko. Despite their constant disagreements, Maiko finds herself unable to stop thinking about him.