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.
| Actor | Role |
|---|---|
 Hanamaru HakataToshiyuki Umino | Toshiyuki Umino |
 Yasuko TomitaChiyoko Umino | Chiyoko Umino |
| 斉斉藤優Matsuo | Matsuo |
 Hiroyuki SeguchiYaeyama | Yaeyama |
| SShunsaku FukubaSasajima | Sasajima |
 Yoshiko InoueMichie | Michie |
 Soma SantokiKenichi Umino | Kenichi Umino |
| SSeiyo MasunagaMasaru Umino | Masaru Umino |
 Hana ToyoshimaEiko | Eiko |
| MMiyoko SakouDen-san's wife | Den-san's wife |
 GorikenDen-san | Den-san |
 Daikichi HakataSuketoudara | Suketoudara |
 Yuko NakazawaNot listed | Not listed |
| NNobuhiko TakadaInao | Inao |
 Miyu YoshimotoMiss Hanashima | Miss Hanashima |
 Tokio EmotoIshige | Ishige |
 Ken TanakaYoshikawa | Yoshikawa |
 DendenMaruo | Maruo |