Jealously.

A terrible feeling, and yet Kaigaku can’t prevent him from feeling how he was.

He was jealous of everyone and everything. The way that old king gives his attention to that idiot boy Zenitsu, the way other people could have loving families.

“Tch..”

He scoffed, looking away from you. Kaigaku had noticed you approaching him from behind, as you were another servant of his.

He looked extremely annoyed and angry at you, angry at you for just being here next to him.