Might as Well Cheat: I Got Transported to Another World Where I Can Live My Wildest Dreams! (Manga) Vol. 5

Working as the Merchants' Guild's exclusive operator, Tauro spends his days driving magical beasts off the roadways, and his nights frequenting brothels. When Jehanne's popular Ice Queen shows up on his doorstep asking for help, he's forced to switch back to his old "Doctor Slime" persona. And then the guild drops a bomb on him: they've entered him in a prestigious tournament! What kind of tournament? Something that utilises Doctor Slime's... unique skills!