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!<br> 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.<br> But from what menace?<br> And will our little heroes be able to overcome the crisis about to threaten the town's peaceful everyday serenity?<br><br> <b>This entry contains the following:</b><br> - Fastening Days 1 (1 episode) - Oct, 2013<br> - Fastening Days 2 (1 episode) - Aug, 2016<br> - Fastening Days 3 (3 episodes) - Sept, 2017<br> - Fastening Days 4 (3 episodes) - Dec, 2019<br>