Nakatsu was laid off at his company and now works part-time at a convenience store. One day, Nakatsu forms a vigilante group to protect his town with Toshida, who has a mysterious physical ability, Kanari, who is a female high school student with excellent information gathering abilities, and Kusaki, who wields hammers under his sleeves. As they punish evil doers, the group gains popular support and flourish.
Unfortunately the movie Maniac Hero is not yet available on HBO Max.
| Art | Hidefumi Hanatani | Production Design |
| Directing | Keisuke Toyoshima | Director |
| Writing | Shigeyuki Fukumitsu | Original Story |
| Writing | Jun Tsugita | Screenplay |
| Crew | Saori Masuko | Script |
| Writing | Shigeyuki Fukumitsu | Comic Book |
| Camera | Hajime Kanda | Director of Photography |
| Editing | Masaki Murakami | Editor |
| Sound | Gabriele Roberto | Original Music Composer |
| Sound | Hiroshi Ishigai | Sound |
| Production | Kenichi Yoshida | Producer |
| Sound | Akihiko Okase | Sound Effects |
| Production | Tomoo Fukatsu | Producer |
| Sound | Hiroshi Ishigai | Sound Recordist |
| Production | Yoshiki Terashima | Producer |
