Oni no Ou to Chigire - Chapter 1 Pg 8

He was born into the Yase family that had a lineage of demon masters continuously since the Heian period. When he was five, he met the small demon, Yato, and when he was eight made a contract with him to make him his servant. According to Yase family tradition, he had to start his work as a demon master with Yato once he turned fifteen. It had been five and half years since then. Tokimori moved out from his family house that he had lived in ever since he was born with his parents and grandparents on his fathers side. He now lived together with Yato in a one room apartment. Since demons cant be seen by normal humans, it looked like he lived alone. Their relationship was like a mutual love between master and servant. The demon master adored his demon servant, and the demon servant loved his demon master. Like a dog that swore his allegiance to him, Yato never left Tokimoris side, and Tokimori never wanted to leave Yatos side. To Tokimori, Yato was his loyal demon servant, but he was also his irreplaceable best friend who raised him since he was young. Because of that, the distinct wall between master and servant crumbled, and the amount of times Yato broke his promises with Tokimori increased. Even though he was prone to spoiling Yato, he needed to put his foot down as his master now. Considering that point, Tokimori crossed his arms in front of his chest and tried to look as serious as possible.