Aichi Sendou is a timid third-year middle school student who has always lived his life looking backwards rather than forward. However, he has a card called "Blaster Blade" that was given to him when he was little, which is the sole thing that sustains him. Then Toshiki Kai, a cool-hearted high schooler, introduces Aichi to a card game called "Vanguard". When participants battle they picture they are on a planet called "Clay", and since Vanguard features a never before seen game system it has…