Cardfight!! Vanguard - 6x20 - Season 6, Episode 20- Followmy.tv

Following some rumors, Kamui goes to a seemingly abandoned facility. He meets both Mamoru and Team Trinity Dragon, and they are chased by a robot. After escaping the robot, they discover a secret laboratory, which turns out to be one of Ryuzu's Stride Force relay stations. They also learn that the FICAs of all fighters have been gathering Stride Force for Ryuzu to use (to summon units from Cray as part of his ambitions). The group is then confronted by the person in charge of this facility, the crazy Kensuke Handa. He separates Kamui from his friends and challenges him to a cardfight. While Mamoru and Trinity Dragon try to escape, Kamui defeats Handa and demands him to reveal all he knows about Ryuzu. However, the facility activates its self-destruct mechanism, and Handa falls through a trap hole. Mamoru returns to save Kamui from the explosion. Although everyone made it out safely, Mamoru expresses frustration over how he had been helping Ryuzu's plans the whole time.