User blog comment:Zathronas/Analysis by an author: "Gold"/@comment-15108745-20131226184438

I'm sort of wondering the same thing as Waters Knight....neither of the girls were adopted, they're not stepsisters, and they're not cousins either. Yet they are blood related. It sounds like Yang adopted Ruby in your post.

Also it does sound like she's repressing her memories of Summer Rose or forgetting them completely. I don't know if that is indeed what you were getting at or not.....

Ruby is already known for recklessly going into battle and getting herself nearly killed. She does that four times in Volume 1. I feel like if she didn't forget those times with her mother and didn't go through some kind of amnesia, she would still know what it was like to lose Summer and how the death affected those close to her. That would then lead her to not be so reckless. She would then be more mature about things. But Ruby is nothing like that. She's just like a child right now who treats battle like some kind of game.