Seikain Girl's Academy, a prestigious institution grooming young ladies in sophistication, conceals itself from society. Graduates, unprepared for the real world, are jolted by its stark differences. To bridge this gap, the school introduces Kimito Kagurazaka, a reluctant commoner chosen to enlighten the girls about everyday life. Compelled to masquerade as a gay man, Kimito befriends Aika Tenkuubashi, a shy student eager for companionship. Together, they establish the Commoner Club to navigate modern customs. Joined by the flawless Reiko Arisugawa, child prodigy Hakua Shiodome, and skilled swordsman Karen Jinryou, Kimito embraces his role as the school's 'commoner sample' amidst a circle of new allies.