Aliases
Fastening Days 2, Fastening Days 3, Fastening Days 4, FASTENING DAYS, Default, Japanese
S144FALL 2014ONA
Part of this franchise
concluded
Announced
In production
Releasing
Completed
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
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
Last updated
Jun 4, 2026, 12:31 AM
Franchise overview
Franchise timeline
Review every Courcast-tracked season for this series and jump between entries.
Renewal pulse
Courcast score breakdown
CourScore is the probability of an official sequel announcement within 18 months, blending attention velocity, completion strength, and catalogue health.
CourScore
35.1
CourScore is the probability of an official sequel announcement within 18 months.
Signal coverage: 92% • Signal freshness: Medium • Updated 8 minutes ago
Top reasons
- Cross-platform audience rating - Weighted audience rating 63.6
- Cross-platform popularity index - Aggregate reach of ~1,834 followers
- Committee renewal track record - Lead committee members (Studio Colorido) historically renew 0% of productions
Runway
Unknown
Source runway is unclear, so feasibility is treated as unknown.
Financial & Commercial42
Production Feasibility24
Audience Reception64
Strategic Priors14
Fandom Engagement0
CourScore history
CourScore over time
Last analysedJun 4, 2026, 12:31 AM
Next scheduledtomorrow
Latest signals
Fresh telemetry
Courcast watches every connected signal to surface the freshest indicators of momentum.
| Source | Metric | Geo | Value | Collected |
|---|---|---|---|---|
| wikipedia | pageviews daily | EN.WIKIPEDIA | 12 | Apr 9, 2026, 12:00 AM |
| anilist | favorites | GLOBAL | 8 | Jun 1, 2026, 12:00 AM |
| kitsu | rating rank | GLOBAL | 6,255 | May 13, 2026, 12:00 AM |
| youtube | views 30d | GLOBAL | 106,215 | May 13, 2026, 12:00 AM |
| youtube | uploads 7d | GLOBAL | 25 | May 13, 2026, 12:00 AM |
| youtube | views 7d | GLOBAL | 106,215 | May 13, 2026, 12:00 AM |
| shikimori | score mean | GLOBAL | 61.4 | May 30, 2026, 12:00 AM |
| anilist | popularity | GLOBAL | 2,432 | Jun 1, 2026, 12:00 AM |
| youtube | uploads 30d | GLOBAL | 25 | May 13, 2026, 12:00 AM |
| mal | plan to watch | GLOBAL | 1,849 | May 25, 2026, 12:00 AM |
| anilist | trending | GLOBAL | 0 | Jun 1, 2026, 12:00 AM |
| kitsu | member count | GLOBAL | 84 | May 13, 2026, 12:00 AM |
| kitsu | score mean | GLOBAL | 68.82 | May 13, 2026, 12:00 AM |
| anilist | average score | GLOBAL | 61 | Jun 1, 2026, 12:00 AM |
| mal | watching | GLOBAL | 1,383 | May 25, 2026, 12:00 AM |
| mal | completed | GLOBAL | 2,030 | May 25, 2026, 12:00 AM |
| mangaupdates | bayesian rating | GLOBAL | 7.63 | May 23, 2026, 12:00 AM |