Mistress of an S-Class Dungeon summary: "The goal is Grade S. Shouldn't that be enough to pay off all this debt?" Succubus 'Adelaide,' inheritor of a contracting dungeon alongside an enormous debt! Somehow, in order to have leisure and food, she needs to settle the debt, but managing the dungeon is proving to be difficult. Amidst this, handsome adventurers keep tempting Adelaide, urging her to consume their life force...?! A cute and lovable succubus's dungeon management story! Original Novel: , Side Story: Original Webtoon: , , , , , , , Note: To sort out confusion. The main novel is R15. The novel side story is R19. The webtoon is following the rating correctly. *The R19 side story is included in the volumes.