Saitama and Genos get bored from beating all of the villains in Japan. They both decided to go to another dimension with a device. They end up landing in the middle of the war between Fairy Tail and the Alvarez Empire. Fairy Tail members were getting pushed back from the enchanted soldiers but Saitama and Genos joined the war and pushed them back. Who will win the war? What will happen to Saitama and Genos? Will they be able to beat Zeref the Dark Mage and Acnologia the Dragon King? Find out in this funny action-packed book!