The main character is a third year middle school student who is a slight coward named Aichi Sendou. The days pass by, and because of that part of his personality, he doesn`t make many friends. But Aichi has one thing which supports him. A single card he got when he was little named "Blaster Blade". It`s actually a very valuable card from the card game that is sweeping the world in popularity named "Vanguard". But one day, a loud and violent classmate of his named Morikawa steals the card from him by force...