Espers. People who possess strength and ability that transcends the capability of humanity. They are saviors of the ever-troubled world where dungeons and cracks exist.

But despite such overwhelming power comes a price they must pay—the deterioration of their sanity; possibly driven and succumbing to madness.

A Guide is what they need. And Noelle, a powerful SS Esper that is on the verge of rampage happens to meet you, a powerful newly SSS Guide.