The story revolves around people who possess the ability to infiltrate human minds and manipulate memories. Their powers have been used in the underworld for covering up accidents, assassinations, and all manner of crimes. But these powers not only destroy others' spirits, but also corrupt the users' own hearts...
In a society where dungeon-crawling prowess equates to social standing, Akisora Shuu is bestowed with the unconventional "Appraiser" class. Since it lacks combat utility, his abilities go unnoticed, leaving him to lead a humdrum and monotonous existence. However, this all changes when a video he shared of a monster he had appraised yields an unexpected result - an instant level-up. As it turns out, he gained experience points every time someone defeated the creature he had recorded. Now armed with an endless source of experience, he sets forth into the dungeons to rescue his cherished loved one.
Princess Eleanor is appointed as the Commander-in-Chief of the prestigious Holy Dragon Knight Order. However, because she assumes the position without any notable achievements, she is met with criticism from those around her. As most of the many knight members withdraw from the order, Adolphus, known by the epithet [Ice Sword], steps forward to serve as her adjutant. He kneels before Eleanor and swears his loyalty—.