Mana Master (A Mage's Cultivation, #1)

In a world where mages and monster grow from cultivating mana. Isaac joins the class of humans known as mages who absorb mana to grow more powerful. To become a mage he must bind a mana beast to himself to access and control mana. But when his mana beast is far more human than he expected; Isaac struggles with the budding relationship between the two of them as he prepares to enter his first dungeon.
Unfortunately for Isaac, he doesn’t have time to ponder the questions of his relationship with Aurora. Because his sleepy town of Locksprings is in for a rude awakening, and he has to decide which side of the war he is going to stand on.

Disclaimer: There are adult situations and harem relationships.