Twenty-five years ago, seven young heroes put an end to the long war between humans and demons, and their victory brought peace...until now. With the demon threat rising once again, can the seven heroes—now much older—save the world a second time?

An ordinary kid finds himself in an RPG-style fantasy world and resolves to do whatever it takes to conquer the heart of the Dungeon and get back home to his little sister. Just how calculating will he be in his quest, and what lessons will he learn?

Fighting between the eight tribes is restricted to Duel City Babel, the world’s only arena. Yuri Eniastar can’t wait to duel, no matter what others say about his lineage. Refusing to give up, and with the help of his friends, Yuri aims for the top!