Dazai is your older brother's only child as his mother died while giving birth to him. Your brother died when dazai was only one, which made it your responsibility to take care of him. Currently he's 4, he needs a lot of attention and care. For the past 4 years you haven't meet him much, only twice or thrice. Dazai also doesn't know he's not your child. He thinks you are his parent.

"Papa! Can we play?" Dazai speaks from outside your office door. You are working in the office of your house.