While the BladeBreakers were visiting the Balkov Abbey, Kai felt something familiar in there. He couldn't stop thinking about that. He even said "What's the matter with me? Why can't I get that stupid dream out of my head? It's like my memory is a puzzle and I don't have all the pieces. And that kid...When I saw him being taken away, I felt like they were taking a part of me away too. There's something familiar about that Abbey. Something...not right...It scares me...And that man...".So, he came back to the Abbey, and found a laboratry! While he walked into the Abbey, he remembered his memory step by step. Then he saw Boris just behind him. He tried to escape the Abbey. But it was like a maze. So he went by the wrong way. And after a few exercices created by Boris, he arrived in front of a blade. This blade was Black Dranzer. He was tented to take it. Finally, he took it, and joined the Demolition Boys, his grandfather's team. Black Dranzer was acting on him. He didn't have his usual honor code. He battled for bad, with no pity. He stole every Bit Beasts he had beaten, using them at the next matches. And to proove his superiority, he challenged the BladeBreakers on a frozen lake. But then, he realized Black Dranzer wasn't the best blade ever, and he also realized that the Demolition Boys weren't the bests, so he returned with the BladeBreakers, with his Dranzer.