A young office lady named Rie Miyagi was shaking on the commuter train. Suddenly, lust appeared out of nowhere on Monday. She thought someone would help her if she called out... but when it came down to it, she couldn't utter a sound, helpless against the perverted advances. Realizing she had no resistance left, he took full advantage of her vulnerability. He commanded her not to masturbate until their next encounter on the same day at the same time. As they continued their twisted relationship during weekdays, Rie found herself craving his rough treatment more intensely... Until one day, her inner desires spilled over. "I can't take it anymore...! Please, fuck me harder!"