From which part?
SPOILERS
Angel's boss finds Leo, and while doing so he finds the runaway angel. He wants to take him back, so they run for it. During their escape they realize that some people actually cared for Kira Kira.
They realize that scum aren't as bad as they look like, everybody has their good sides, so angel Kira decides to go back to work (he didn't like It because he didn't want to deal with scum, so now that he can see the good side in them his job looks better).
For some reason I don't understand his Boss gives him some free time before going back to work. That's when Leo's girlfriend explains why he hated Kira Kira as much: they were opposites. Kira had a great name and money and a lot of people around, but was letting his life go down the drain and despised his wonderful name. Leo had a boring name (is it really that boring?) and was poor and people bullied him and he had to sweat blood working to make his life count.
Kira Kira starts realizing he is luckier than he thought, so he fucks his boyfriend and goes to look for a job. And happy ending because they don't live together anymore, but angel Kira comes to visit his lovely cream bun anyway.
Thank you!
You are welcome (⌒▽⌒)
I didnt understand the ending