電車内でなう。

In the morning, on the train to school. The main character, Ryuhei Ishido, Witnesses a girl being molested by a thug. After briefly accessing the situation and seeing that no one was helping Ryuhei steps in to help the girl. The thug gets quickly dismissed by Ryuhei's Aikido skills and the incident ends safely with the girl thanking Ryuhei. However, later that night, A man accompanied by the thug from this morning appears and calls himself a Chikanshi and challenges Ryuhei to a Chikan game. The man also says that if Ryuhei refuses, He will stalk him around every day for 24 hours until he accepts. Although reluctant, Ryuhei responds to the man. Ryuhei takes a deep breath, Let the Chikan showdown begin!