FASTENING DAYS
Youji 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: Youji 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? This entry contains the following: - Fastening Days 1 (1 episode) - Oct, 2013 - Fastening Days 2 (1 episode) - Aug, 2016 - Fastening Days 3 (3 episodes) - Sept, 2017 - Fastening Days 4 (3 episodes) - Dec, 2019
Names
| Original | FASTENING DAYS (latin) |
|---|---|
| Romaji | FASTENING DAYS |
| English | — |
| Chinese | 拉链超人组 (simplified · via bangumi) |
| Also known as | FASTENING DAYS 2 · FASTENING DAYS 3 · FASTENING DAYS 4 |
Facts
| Format | ONA (net original) · 8 ep · 5 min · 1h total |
|---|---|
| Aired | 2014-10-30 → 2019-12-19 (Autumn 2014) |
| Status | FINISHED |
| Studio | Studio Colorido |
| Source | Original work |
| Origin | Japan (Anime) |
| Genres | Adventure |
| Themes | Primarily Child CastSuperheroAdvertisementRobots |
Reception
| Community score | 6.27 / 10 |
|---|---|
| Bayesian score | 7.05 / 10 |
| Composite | 42.3 |
| On lists | 2,476 |
| Favourited | 7 (0.3%) |
| Completion | 62.0% |
| Drop rate | 9.0% |
| In backlog | 32.0% |
| Score spread σ | 1.62 |
Score distribution
Where it places
| Cohort | Value | Tier | Rank |
|---|---|---|---|
| Studio | Studio Colorido | — | 19 of 21 |
| Broadcast season | Autumn 2014 | E | 86 of 99 |
| Year | 2014 | D | 303 of 389 |
| Format | ONA (net original) | E | 700 of 857 |
| Length | Short-form | D | 865 of 1,250 |
| Era | Early 2010s | D | 1,277 of 1,627 |
| Genre | Adventure | E | 1,349 of 1,534 |
| Source material | Original work | E | 1,392 of 1,732 |
| Season (all years) | Autumn | E | 1,619 of 1,921 |
| Origin | Japan | E | 5,882 of 7,157 |
Key staff
| Director | Hiroyasu Ishida, Tomotaka Shibayama, Shingo Yamashita, Tatsurou Kawano, Moaang |
|---|---|
| Character design | Tatsurou Kawano |
AniList id 20927 · MAL id 28205 · Bangumi 116747 · record updated 2026-08-26