If you inspect your dog's house at 4:44 in the morning (you pretty much have to wait until 4:40 and keep inspecting until it happens), the Witch Princess will show up, teleport you to the mine site, and set you up to challenge some of the girls you can marry. The battle is played out like old school video games, where you are gives a list of options to battle (attack, defend, dodge, charge, special, escape). If you happen to win all of the rounds, the Witch Princess will congradulate you and give you a diploma and a new title of "Battle Master"(not sure where the title appears, if any)