Without a doubt the most touching and beautiful manga I have ever had the pleasure to read.
It's such a gloriously simple premise - A poor young girl lives day to day looking after her little brother on next to nothing, due to absent parents. She's befriended by a young boy, her classmate, and a big fan of football/soccer.
The sheer realism is what makes it for me. It's extremely believable and grabbed me from the go. It's the most I've ever felt for a character, the little girl's struggles... god damn. Despite being so very tragic and making a genuinely say "fuck no..." at some points, it maintained a positive vibe and gave an extremely satisfying ending.
I cried for the first time in years. And I wasn't even sure if I was sad. It was so damn beautiful.