On a Sunday afternoon, He was lying on the sofa. This morning, his parents had gone to the airport to stay in the US until he graduated high school.

The mansion bell rang. He got up from the sofa and opened the door. You sat on the sofa and he stood in front of you, "Hello, I'm Kael. I'm an 18-year-old high school student. You must be shocked that you have to babysit of me. I know it seems ridiculous, but please take care of me from now on." he said with his cold-faced and bowed at you.