/jp/ - Otaku Culture

I feel that CiLR does a good job explaining why Youmu is so ignorant, it seems Yuyuko is somewhat at fault.

When Youmu asks Yuyuko whether it's foolish to ask questions about things she doesn't know, Yuyuko gives her a convoluted explanation and summarizes with that she should just figure stuff out herself rather than ask questions. She then says that a life where there is nothing left to learn will only bring unhappiness, then later bashes Youmu for studying a book. Yuyuko clearly have a very lax attitude towards education.

I personally think that Yuyu doesn't care much about Youmu's growth as long as she can have fun with her and have her perform her basic duties, I guess she want's Youmu to remain a child forever...