Yoji and Kei, a boy and girl, live in a town in the not-so-distant future with their foster parent, Anna. But these seemingly ordinary children have a secret hidden even from their unsuspecting mother. Yoji and Kei are superhero defenders of their town! With a flap of their capes, the two of them and their robot bear sidekick, Oscar, protect the citizens in their town with their handmade high-tech machinery. But from what menace? And will our little heroes be able to overcome the crisis about to threaten the town's peaceful everyday serenity?
Unfortunately the movie Fastening Days is not yet available on HBO Max.
| Directing | Hiroyasu Ishida | Director |
| Visual Effects | Hiroyasu Ishida | Animation Director |
| Sound | Hiroki Matsuoka | Sound Director |
| Sound | Yoshinori Sunahara | Original Music Composer |
| Visual Effects | Hiroyasu Ishida | Character Designer |
| Visual Effects | Kei Masaki | Animation |
| Visual Effects | Kunihiro Ishii | Animation |
| Visual Effects | Kentaro Kurisaki | Animation |
| Visual Effects | Yojiro Arai | Animation |
| Visual Effects | Maki Ikeda | Color Designer |
| Visual Effects | Emi Kojima | Animation |
| Visual Effects | Yuri Yamamura | Animation |
| Visual Effects | Mayumi Yodomura | Animation |
| Visual Effects | Toru Terumichi | Animation |
| Art | Kazuhiro Murakami | Art Designer |
| Sound | Toshiya Wada | Sound Effects |
| Art | Hiroyasu Ishida | Storyboard Artist |
| Writing | Junichi Tanaka | Screenplay |
