Rikiya Shoda is an engineer working for the Atomic Agency in Japan. One day, his wife Nanako returns home with a lost teenager called Ayu. A man, pretending to be the father, comes to get her back; Ayu keeps telling him that Rikiya and Nanako are her parents. Through this disruption, Rikiya suddenly starts remembering his youth as a revolutionary.
You can now watch Heroic Purgatory online on the following streaming providers in the United States.
| Production | Yoshishige Yoshida | Producer |
| Editing | Hiroyuki Yasuoka | Editor |
| Writing | Masahiro Yamada | Writer |
| Art | Osamu Yamaguchi | Art Direction |
| Directing | Yoshishige Yoshida | Director |
| Sound | Toshi Ichiyanagi | Music |
| Costume & Make-Up | Hanae Mori | Costume Design |
| Camera | Motokichi Hasegawa | Director of Photography |
| Directing | Masahiro Moro | Assistant Director |
| Production | Sei Okamura | Producer |
| Lighting | Tsutomu Kamata | Gaffer |
| Directing | Sei Okamura | Assistant Director |
| Sound | Tetsuo Segawa | Sound |
| Directing | Hiroshi Takano | Assistant Director |