Seventeen-year-old Kinjiro Sakamachi leads a seemingly normal life, except for his peculiar fear of women, gynophobia, marked by spontaneous nosebleeds. However, a chance encounter in the school restroom shatters his world when he learns that the charming and popular Subaru Konoe is, in fact, a girl! To add to his troubles, the principal's daughter, Kanade Suzutsuki, takes pleasure in tormenting Kinjiro to safeguard this secret, while also attempting to cure his phobia. Is Kanade malicious or genuinely concerned about helping Kinjiro? For Kinjiro, caught in this turmoil, it hardly matters as his existence spirals into a nightmarish ordeal.