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

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