High school student Kinjirō Sakamachi had a rude awakening from his sister, Kureha Sakamachi. After he arrives at school, he narrates the circumstance of Subaru Konoe being a butler of Kanade Suzutsuki. It was then revealed he may have gynophobia, after a weird encounter with a woman with supposedly cat ears. He cools himself off in the toilet where he discovers Subaru Konoe wearing girl's panties, a dispute happens and Subaru starts chasing Kinjirō. After an attempt to save Subaru from a falling object. Kinjirō discovers Subaru is a girl from her chest, the angered Subaru knocks him unconscious and he wakes up in the infirmary, chained to the bed except for one hand which he uses to discover Kanade by his side, after being teased by her she explains her family's circumstance and why Subaru has to dress up as a boy. She threatens Kinjirō with a violent Subaru and his gynophobia(and nosebleeding when a girl touches him). It is then revealed that Kanade might be a sadist. She forcibly forms a contract with him to keep the Subaru gender matter a secret and finding a way to cure his phobia. Then begins his nightmarish school life