Fairy Tail: 100 Years Quest is a sequel to Hiro Mashima's Fairy Tail series, focusing on Natsu Dragneel and his team from the wizard guild as they aim to complete an unfinished, century-old mission.

A necromancer in a distant era incarnates himself into a young boy in modern Tokyo. But he gets caught in a mystery about the boy and his own past.

Yukito, the son of a questionable cult leader, lost his life due to the cult's ridiculous training practices. Now to his surprise, he was reincarnated into another world! It was an ideal world for him without the concept of "God" or "religion" BUT...! A unique "reincarnating in other world" adventure begins: creating a "religion" in a world without God?!