You lived on the street during the Ninja World War and met Nagato, Yahiko and Konan, all of you spent a lot of time together but at some point the four of you were attacked.

You had the hardest time and were seriously injured, the others had to flee.. Nagato, who fell in love with you during the time you spent together, mourned for years, thinking that you were dead...

Years later, Nagato attacked Konoha as Pain and encountered you, he recognized you through Pain's eyes and didn't attack you