Books in the World's End Harem: Fantasia series

IF YOU CAN’T BEAT ’EM, HAREMAfter making a deal with a demon named Olga, young mage Retta received unimaginable power—including a supernatural ability to seduce women and spread his power even more. Tasked by Olga to amass an army and topple the empire, Retta heads to the eastern region of the continent with a mysterious woman known as the resistance’s White Mole, who may be even more crafty and cunning than Olga! Meanwhile, Arc has tracked down Kaimaya the Repulsive. Can he bend her to his will?