I am trying to put together a list of siblings in anime where the younger is more mature than the older. I know there have been several, but all I can remember are:
B Gata H Kei, aka Yamada's First Time. Naïve, stupid virgin Yamada not only wants to lose her virginity, but also wants to have sex with 100 different boys (not all at once). Her choice for her first is fellow virgin Takashi, but clueless Yamada always screws it up. No pun intended. Little sister Chika is more mature and more aware. It's been a while, but I think Chika is a little embarrassed by big sister's lack of mental prowness.
K-On. Yui may be a high school student and a budding pop star, but she has the emotional level of a six-year-old. That's part of her charm actually. But it is little sister Ui who is the responsible one helping to keep the house in order, including cooking the meals, in the absence of their parents.
That's about it. Can't think of any more. Can you?
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