On his twentieth birthday, Tatsuya encounters a black cat that mysteriously grants him a surprising transformation: from a tough guy to a stunning beauty. This newfound allure, however, attracts unexpected attention and danger. Amidst chaos, his childhood friend Kentarou arrives, offering a glimmer of familiarity in this bewildering situation. To break the enchantment, Tatsuya must navigate a peculiar solution tied to his body's unusual changes.