Mushoku Tensei: Jobless Reincarnation (Manga) Vol. 14

DUEL WITH THE DEMON KING

It's Rudeus's first autumn at the Ranoa University of Magic, and with the turn of the seasons comes a turn to...mating season! The beastfolk are in heat, and a whole pack of hot-blooded beasts arrives to demand a duel with Rudeus for Linear and Prucena's paws in marriage. Worse, Badigadi, the king of all demons, suddenly appears to challenge him to battle! Amidst all the chaos, Rudeus has an unexpected meeting that just might change his destiny...