Poppoya-san: Nonki Kikanshi

A young, carefree engineer works for the Japanese National Railways, enjoying his job driving trains with a relaxed attitude. His cheerful demeanor and lack of caution define his daily routine on the rails.

One day, his carelessness leads to a critical mistake while operating a train, putting the journey and those aboard at risk. The incident forces him to confront the consequences of his actions and the importance of responsibility in his role.