Sana Matsunaga, an office lady who quietly handles desk work in a corner of the company. With her black hair and black-rimmed glasses, she appears innocent and gentle, so male coworkers often dump extra tasks on her. Too kind and timid to refuse, she always accepts with a smile. Within the office, she's an inconspicuous presence, seen by men only as a shy, unnoticeable employee. But one day, the male staff take a closer look and tease, "Wait, Matsunaga’s actually got big tits, huh? (lol)." These casual words open an unexpected door to lustful dreams in the minds of men who never knew her true nature.