Yui Hinata, a first-year office worker, on her very first day of work, is subjected to extreme torment by her lecherous company president, including cunnilingus and forced insertion with a golf club. Under the pretext of bra development, she is exposed in front of her coworkers, enduring the humiliation of revealing her breasts. Within the office, she is molested by everyone, forced into aggressive titty fucks. Even at sales meetings, her breasts are sucked and she's coerced into intercourse. After returning to the office, she faces sexual harassment from two colleagues in the staff lounge. Amid these circumstances, Yui's L-cup breasts are exceptionally large and alluring, naturally drawing attention. Her voluptuous figure becomes a source of workplace chaos, and deep within Yui's heart, something begins to awaken.