A suspicious-looking boy, Akiharu Hino, transferred to Hakureiryō Academy, a boarding school once known for only high-class young ladies. However upon his arrival, he encounters Selenia Iori Flameheart who accuses him a delinquent and causes uproar throughout the campus, until Akiharu meets his wicked childhood friend Tomomi Saikyo who clears the misunderstanding by telling everyone an embarrassing future goal of Akiharu's.

Upon seeing the score result for an exam, Selenia and Tomomi remark their days since their first year meeting at Hakureiryō Academy, where they eventually become rivals to see who's the most diligent and growing lady. Meanwhile, the academy's water system goes out-of-order, and have to use a indoor natural hot spring for the time being, where the servants and uppers are getting into perversions.