I’m Quitting Heroing, Vol. 2 English Version Manga

Hiding his identity as the Hero, Leo Demonhart has managed to sneak his way into Demon Queen Echidna’s forces…but he has his work cut out for him. When faced with an assassin who struggles to communicate and a warrior who doesn’t understand how to educate others, Leo knows the best solution is for them to take a page out of his long, long book. After all, he’s got a whole lot of experience under his belt, and his history stretches back further than anyone could have ever guessed…