In Yuusha, Yamemasu; after saving the world, Leo becomes a threat to the kingdom. Now, he is looking for a job, and the Demon Lord he defeated wants to rebuild and is hiring.
In Shikkaku Mon no Saikyou Kenja, the world's most powerful sage decides reincarnation is necessary to become stronger, however, he wakes up in a weaker world.
In Slime Taoshite 300-nen, Shiranai Uchi ni Level Max ni Nattemashita, after living a painful life as an office worker, Azusa dies and ends up in a new world, after 300 years she is incredibly powerful.
In Kaifuku Jutsushi no Yarinaoshi, Keyaru is a healer, unfortunately for him, he is abused relentlessly by other knights. However, when he achieves the ultimate magic, he goes back in time to redo his story.
In Mushoku Tensei, a man regrets his life before being killed in a traffic accident. He is reborn in a world with magic, and resolves to live his life without regrets.
In Kami-tachi ni Hirowareta Otoko, Ryoma is a lonely man who led a life filled with hardships. He dies, however, in the afterlife he is greeted by three gods who send him to another world as a child.
In Honzuki no Gekokujou, Motosu, a student and soon-to-be librarian, ends up crushed to death beneath a pile of books. She wishes to be reincarnated and read books forever, fate, has other plans.
In Maou-jou de Oyasumi, the beloved princess Syalis has been kidnapped by the Demon Lord, however, her only concern is finding the perfect spot so sleep in his castle.
In Hakushon Daimaou, 50 years later, Hakushon and his family return to Earth. They meet with Kantarou, the grandson of Kan-chan, his old friend.
In Dragon Quest: Dai no Daibouken, Dai is the only human on an island and longs to be a hero, he lives in peace with the monsters. However, his life changes with the resurrection of the Dark Lord Hadlar.
In Burn the Witch, historically 72% of all the deaths in London are related to dragons, Ninny and Noel are agents for Wing Bind, and they protect and manage them.