Ai walked past Saki in the street and a conversation later Saki had declared herself Ai's friend. This was strange for Ai. Saki soon became a close and dear friend to Ai. She was dark, she understood being alone and things Ai was struggling with. She adopted Ai as a little sister in a sense.

Saki liked to braid Ai's hair and hug her. Ai wasn't used to hugs before she met Saki. Saki helped her a lot with her humanity and was the most important person to Ai for a long time.

When Saki was droned, Ai briefly lost control of her emotions and rage and went around burning things. She was talked down by Aaron but for a while she regressed into the little girl who simply wanted people to pay for hurting her.