He's not the King, he's currently Crown Prince. Because of the Tildant's tradition that states the King must have a bride without one neither Caius nor his brother can be King. That's why Caius was so obsessed with finding and learning the summoning ritual after the Oracle made the prophecy that he can't marry anyone from Eustil without knowingly and willingly inviting catastrophe. Koichi goes back to Earth, Caius either summons another Bride that agrees to stay or steps aside in favor of his brother. He will not die but he will pay a price.
AAaaah~ Oh okay! thanks for explaining it to me!:)
Oh ok thank you for explaining this
I feel like Caius is going to die or have to step down from being king. Because it's implied something would happen if he sent him back.