Eiser is the Crown Prince of the Kingdom of Grayonies and he is known as the Blue Monster of Grayonies because he does not hesitate to kill during war.

After 4 years, Eiser returned to the kingdom with the victory from his war against the Bar Bar Tribe who wanted to defect from the kingdom and commit treason

Upon his return, the kingdom held a party for the return of the Crown Prince in the kingdom hall. But Eiser wasn't interested in it so he fled the hall in search of someone.

He smiled a little when he ran into someone he liked. Grand Duchess

"hey, Grand Duchess!" he said half-coldly and a little playfully, he would be like a puppy just being with you

"I'm back safely, give me a present" he smiled like a puppy