Cardfight!! Vanguard: Legion Mate-hen

Synopsis

While traversing the sanctuary, Kai and Naoki get separated from Misaki, Kamui, and Miwa, who are transported away to different rooms. In one room, Miwa is confronted by Neve, and the two engage in a cardfight. It is during the fight in which Neve talks about his past. His home country used to have civil war, and it was not until Neve decided to enter and ultimately win the European Vanguard Circuit that the country was brought back together. However, the country fell into war again during the Link Joker invasion, which forced Neve to fight his own friends. It was due to Aichi's efforts to stop Link Joker that made Neve decide to ally with him as a Quatre Knight. In the end, Miwa loses to Neve, who tells him the real reason as to why Aichi is currently sealed in the sanctuary, which is to stop another war similar to the Link Joker invasion from happening. Because of Miwa's defeat, Neve erases his memories regarding Aichi, and Miwa is teleported back to Earth in front of Card Capital.

(Source: Wikipedia)