The World's Finest Assassin Gets Reincarnated in Another World as an Aristocrat

Pretty young girls have been captured and are being sold off at an illegal auction. Marquess Collide is engaging in human trafficking, and all her buyers are evil nobles as well. By royal order, Lugh the assassin, Dia the mage, his assistant Tarte, and Maha the intelligence expert begin their investigation of Marquess Collide. However, Dia is captured by Marquess Collide and put up for auction--