Description: 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 asecret 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?<b>This entry contains the following</b>- 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