I’m good at support roles, can I join your party?" Ragdishart, a young explorer, has the ability "Enhancer": an ability only chosen by 1 in 100, and is infamously considered the weakest ability ever. No-one would let him in their party, but little do they know, he holds a second, more powerful ability. "Multitasking", which means he can simultaneously control 10 or more arts. Requiring superhuman concentration ability, it takes him only 3 minutes to be able to strengthen his physical ability 1024-fold. Hence, Ragdishart is both the “weakest” and “strongest”. In his adventures, he travels to a ruined tower that extends to the moon, called “Lunatic Babel”. When a human boy meets a deity girl, the story begins.