Her husband suddenly became unable to work, and their household finances quickly collapsed. Faced with the harsh reality that her part-time job at the convenience store alone could no longer sustain their life, Saya Kirijou pleaded with her store manager to increase her shifts. In response, the manager offered to raise her hourly wage—but under a hidden condition: she must offer her large, soft breasts and nipples as part of a secret side job. With no other options and determined to survive on her own, Saya accepted the offer. As her pay increases through this underground work, so too does the growing sense of taboo and pleasure. What began as an act done solely for her husband's sake now drags her own desires into the abyss, pulling her deeper into an inescapable spiral.