In the present era, adventurers, demons, heroes, and demon lord, are no longer occupations that put one's lives at stake. With the world at peace, it is an era where conquering dungeons has been transformed into entertainment. Adventurers and monsters are able to fight with a substitute body made of magic, popularizing dungeon conquests with no deaths. Having lost his job, the "Black Mage" Remme struggled with finding another party until one day a beautiful woman appeared before him telling she had a job for him.
Due to an unfortunate death, a young man reincarnates under the name Eld in a world very similar to the VRMMO that he played before his passing. However, this world he found himself in didn't even know what basic skills were! As the only person with knowledge beyond the populace, Eld sets off on a journey as a level 1 novice to job change into the strongest class in the world, Sage!
An android whose mission had been long completed finds a child abandoned in the ruins of a war-ravaged city. Amidst a dystopian world, a machine and human become mother and son.
This is the serialized version of the popular "Mechanical Buddy Universe" X comics by "Knight's & Magic" author, Takuji Kato.