Toshiyuki and his wife, Chiyoko, run a store named “Fukunoya” in Fukuoka. They become friends with a takoyaki (octopus dumpling) stall owner named Tsuru and try to help her out, as does the rest of the kind-hearted community.

Based on the TV series from the same name, Mentai Piriri stars Hanamaru Hakata, the icon of Hakata, Fukuoka, alongside Yasuko Tomita, who both starred in the television show playing husband and wife respectively. With additional scenes not depicted in the original show.

Hiroyuki Tachikawa is 28-years-old. He quits his job due to severe quotas and difficult relations. His girlfriend, Chieko Takanashi (Eriko Nakamura), also kicks him out. Hiroyuki Tachikawa then decides to go to the small port city of Tsuyazaki in Fukuoka Prefecture. There, he meets a 72-year-old woman, Fukuko Hanada. She doesn't know why, but she likes Hiroyuki Tachikawa and takes him to different places. The young man soon picks up on the meaning of happiness.

Long is a Taiwanese killer known for his sword skills. After Long fails a Tokyo mission, he moves to a small town where no one knows about him.