Jinsei Gyakuten Dungeon人生逆転ダンジョン; Life Reversal Dungeon

"I know everything about the dungeon, and I'm gonna turn my life around!" A bullied virgin whose life has hit rock bottom. But when it comes to his knowledge of the dungeon, he's number one in the world. His name is Saeki Kenichi, a high school student. At 16, his magic finally awakens! Kenichi becomes the 'Seeker' he's always dreamed of and heads straight for Dungeon Islanda lawless zone of pleasure and violence!! Using the knowledge he's stockpiled, he'll mow down the strongest monsters and 'release his magic' (have s*x) with the hottest girls!? Use your knowledge to dominate and take it all!!