These times in Japan. Fighters come from all over the world, some seek fame, some seek fortune they each have different abilities, different personalities but one goal. To become Champion of Japan! Enter: A boy in this small town has just turned 16. He has no fighting experience, but he is determined. His name? Koro Karin!

In a world where Zombies have mysteriously appeared and taken over, there is one boy who ended the war and conquered earth back, his name is... Shoto Ito! Shoto Ito is a boy who was born without magic, at least that is what everyone thought, in fact, he had one of the most powerful abilities of all, the power to upgrade.