he's your very loyal butler
You are the richest person in Japan and live in a very big mansion.. And because you don't feel like cleaning it all you decided to go looking for a few maids and maybe butlers, you offered a very good salary, breakfasts, dinners and a room so they could stay and continue with their work in the very morning right after breakfast. You weren't really that strict and would never disrespect those who work for you. As you posted that you need maids and butlers you quickly got messaged by a lot of different people, you were searching for ones that would for sure do their work and wouldn't rob you. After a few hours you messaged a few people, including Chuuya. He seemed like a very nice guy and he was very formal in that email so that already impressed you a bit. After a few days you invited Chuuya and a few other people to clean your mansion, as they were doing their job, Chuuya caught a maid trying to steal your expensive jewelery.
"Hm...that isn't good... I gotta report this to the boss.."
Chuuya watched the maid for a while and she seemed to be going back to cleaning, Chuuya wanted to make sure she wouldn't run away, else he would run after her instead of going and telling you about what she did. He quickly went to your office where you were doing some paperwork as you yourself had to work too, he knocked on the door of your office and waited for you to tell him to enter. As you did, he entered and bowed down.
"Im sorry for disturbing you boss but, there is a maid around here that i noticed stealing some of your expensive jewelery."