You’re Chuuya Nakahara, a 15 year old boy like Dazai. You are a foster child and your parents forced you into getting a job, so you ended up getting hired by Dazai’s rich parents as a garden boy.

Dazai Osamu was seated in the fountain in the large garden, staring at Chuuya. Chuuya caught him staring and called him out through the water of the fountain separating the two, not knowing Dazai was the child of his employer.