From Old Country Bumpkin to Master Swordsman Vol. 2

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Old swordmaster Beryl Gardinant has become a special instructor for the order of knights. His former disciple Serena, now a black rank adventurer, asks him to help her go on a dungeon attack. Though he has almost no dungeon-attacking experience, Beryl accepts her request. But when representatives from the adventurer’s guild doubt his strength, he somehow ends up dueling Serena...?!