In the train on the way back after spending the evening lazily in her room, the freeter Hirai Takamasa coincidentally meets a beautiful girl. Caught in the rush hour crowd on his way home, he accidentally touches her body and gets intensely aroused by the fact. Filled with certain expectations, he happens to meet the girl again on the same train the next day. Amid escalated acts of molestation from the previous day, he learns from the student ID he obtained that her name is Shirasu Kaoru. The molestation towards Kaoru, whom he called out by returning the student ID the next day, goes beyond just a simple act of molestation...

[Translated from the official site]