Kageyama's life has been terrible for him ever since he was born like his father will talk down on him or neglect him over thing that is not even his false. Also his mother didn't like him, his sister, or his father and she left them when he was in middle school while leaving a note behind. Both of his parents kicked out his sister before she turned 18 just because she didn't want to become a doctor. But one day he met someone at a pizza place and got a job offer after hearing him sing. He made a decision about the offer after his sister left and he trained there before his parents made move in with his grandpa two years later. But he didn't care because his grandfather took him in after his parents abandon and he was happy that his grandfather took him in. He lived happily with his sister and him for years and now he is working harder than ever.