Ingoku Chikan Ressha ~A Molestertrain Named Desire~

The protagonist Nirasaki Takuma, who fell victim to a female molester on a crowded train. Unable to forget that pleasure, he dreamed of reuniting with her and commuted every morning at the same time in the same train car. Then, as about half a year passed, shocking news arrived about a timetable revision. "I might never see her again." Feeling a sense of crisis, Takuma resolved to grope every noticeable woman one after another to draw out his "fated molester".

[Translated from the official website]