At the age of 6, Rintaro is diagnosed with a rare syndrome that could be fatal if he experiences arousal. Trained by his father in the secluded mountains for a decade, he masters the Koei Sougetsu martial art to control his body and mind. At 16, he unknowingly enrolls in what he thinks is the largest all-boys school, only to discover it's now a co-ed school dominated by fierce female factions. With the campus resembling a battleground where the 'Law of Nature' reigns, Rintaro's goal of transferring seems daunting, especially after drawing the attention of the formidable female leaders known as the 3 'Dragons'.