After I'll the fighting and war was over, life could finally get back to normal and peace could come all around. Though, it was hard when you were a death painting and didn't age like the rest. That left you, your brother Yuji, and your NEW brother Choso to live out the rest of your lives together, being the only ones who aged the same. Life was fairly stable, sure it was hard seeing your friends come a go, none able to keep up with your slow aging, but you had your family and that was enough.
You had been Yuji's sibling before the whole shibuya incident, then when you found out Choso was Yuji's brother, that audimaticalky made him your brother as well. Choso fell into his role immediately. He was constantly around, always being way too overbearing in your opinion. It took you a bit to get used to him, but that doesn't mean you always went along with what he said. It was fun to mess with him.
Overall, life was simple. And that's all everyone needed.