Tsubomi Fuyuno (16) is a high school girl with a good mix of gal and yankee elements. One day, her useless father suddenly goes missing, and she has to move into the school dormitory. She had heard it was a cheap, run-down apartment, but it turned out to be a mansion!! Due to a mistake, she ended up moving into 'Tachibana-kan' instead of 'Tachibana-kan'...! And thus begins her lively and somewhat skin-colored (?) daily life with the unique and wealthy high school girls living there!