Riko boards a train surrounded by people she trusted, completely letting her guard down. In an instant, an unexpected situation unfolds as countless hands begin groping her. The very people she once believed in thrust into her anus one after another. Amidst the relentless series of assaults, she reaches climax repeatedly, drenched in copious amounts of semen. For her, this becomes an unimaginable, life-shattering experience.