A traffic safety film for elementary schoolers. Yat-chan was a young boy who knew traffic rules but proceeded to not follow them because he thought playing in the street was more important. He gets into an accident and passes away. Miko is his childhood friend and classmate and is devastated at the loss. The film ends with her aggressively crying as the sun sets and a dragonfly passes by. In a non-traditional manner of traffic safety films, the short film aims at an emotional tactic rather than teaching safety rules. As a way to guilt children into following traffic rules they already know because their death would rip apart those who love them.

Continuing on from the previous film, this OVA features ghost Yat-chan teaching traffic safety to a martian visiting Earth. The martian is able to see and speak with the spirit of Yat-chan and Yat-chan vows to make sure the martian doesn't meet the same fate as him.

Yat-chan is still hanging around as a ghost but has now gained supernatural powers to teach people traffic rules through a laser beam out of his finger, though people still cannot see nor hear him. In an odd parallel Yat-chan follows a boy named Ken-chan who looks a lot like him, who acts a lot like him (irresponsibly near traffic) when he was alive, and who also has a childhood friend and classmate named Miko (unrelated to Yat-chan's Miko from the first OVA). Ken-chan nearly perishes the same way Yat-chan thanks to Yat-chan using his beam to save his life. Ken-chan encounters a few other people who are ignoring traffic safety and with Yat-chan following, they help some people out. Such as an elderly woman who tries to cross a road because to tired to climb up the stairs of a pedestrian overpass.