If I had to describe "Decade", it would be akin to a disaster.
Based on R.IA's translationHe travels through many parallel worlds, and destroys the laws of those worlds.Decade...
This time, this ark of yours is where you'll die!That's why I lured him into this world.In a world without Riders, and with his actions restricted due to his responsibilities as a "Sensei", he can no longer act as he pleases.And now, Kivotos' most powerful student is sent to Decade as an assassin.Kukuku...
So you're planning on using Kivotos as his cage?That's right. We'll keep him here forever.As that person hoped, he became "Schale's Sensei" in this world. He was given the inconvenient responsibility of protecting students.