King Game: Sixth Prince vs. Third Prince
Homura, third prince, fell in love in his brother, sixth prince, Airi, when they were kids. Younger prince was very sickly at that time and his brother started to learn medicine (with poor results) in order to heal him. Now they are grown up, they are lovers (by name only) and Airi is bigger and no longer sick or weak, but not in Homura eyes. Sixth prince decided to change that.

Kaizoku Game: Pirate vs. Fifth Prince
Fifth prince Yuuri tried escape from castle and ended on pirate ship that belonged to Kuuron. From this point young prince starts living on ship and being the captain's "woman".