OITEKEBORI NO RENKINJUTSU SHI (MANGA)

Heroes summoned to another world by the Goddess to defeat the Demon King. Despite the sacrifices, they defeated the demon king, and all the survivors returned to their original world... or so it was supposed to be. The alchemist Mitsumichicho, who was supposed to return with them, was left alone in a different world because he was synthesizing in an impregnable workshop that repels the power of the goddess when he was repatriated. The production fantasy comicalization of surviving in a different world that has been left behind begins!