About the Hazure Skill Legendary Assassin Manga Volume 5 (Mature)

Guild workers from all over the country are gathered for a special class, and Roland is no exception. But when he notices an instructor that doesn't quite seem to be as skilled as he makes himself out to be, he decides to take him down a peg or two before returning to his 'normal' class. Once that's done, he's ready to head back, but before he can leave, he's suddenly summoned by his old guildmaster...