Doctor X no Jitensha Anzen Seminar

Satoru, Akira and Ichiro are riding their bicycles recklessly, weaving between pedestrians. They nearly collide with a car at an intersection, but a mysterious figure named Doctor X saves them from the accident. After the incident, Doctor X sends them a letter containing photographs of an alternative future.

The pictures show the disastrous outcomes of their lives if he had not intervened. The boys must confront the consequences of their careless behavior and learn the importance of bicycle safety.