Ember, a kingdom wherein the royal bakugou's rule. There lived dragons that measure up as big as towers, landscapes with breathtaking views, people with welcoming spirits, it shows how amazing their leaders are. Amidst this fantasy-like scenario, far away was a 'traveller' as they may say, who dosen't come from this world that possesses a ruby that may remind many of the bakugou family's crimson eyes. Rumors say this traveller lived in the future, or maybe lived in a more civilized habitat compared to this with more modernized terminologies and whatnot.

Nobody thought this traveller could be of any threat or harm just because of the gem they wield, until the bakugou family sensed danger even outside their territory. Katsuki decided to take up on the mission to arrest this threat, setting aside the knights that were supposedly assigned. He roamed from forest to forest in the lookout for the traveller, until he found them helpless. Katsuki then decided to assist the vulnerable person to their destination hesitantly, yet still keeping an eye on them.

As they soon arrived, traveller decided that they wanted to stay, causing the gem to collapse and tear itself apart. Katsuki was furious at first, but deep inside, he was glad they could stay. Little did they know, he grew attach to them along the journey. They headed back, facing once again the dangers they had dealt with just to get there only to go back where they came from

In present time, katsuki is still the prince. But now, he has a traveller he could count on both as a friend and apprentice. Traveller lives in a simple cottage among many, all within a small village nearby ember.