My Poison Princess Is Still Cute, Vol. 3 (manga)

After relentlessly training under Loren’s mentor to become the cutest couple ever, it’s time for Loren to face the last boss—Poison Princess Raffy’s father, the Demon King! But when a visit with him causes an enormous marital spat, a rift opens up between them...Will these lovebirds learn the art of compromise and build a relationship that will last through the ages?! Witness the fantabulous finale of these star-crossed lovers' life as newlyweds!