Sendou Aichi, the central character, is a shy and unremarkable student in his final year of middle school. "Blaster Blade," a valuable and cherished card from the world of "Vanguard," a game set on "Planet Cray," has always provided Aichi with solace. When he crosses paths once again with the card's original giver, Toshiki Kai, Aichi's mundane existence transforms in a profound way.