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OP, if you are being serious and still checking the thread and genuinely want to do that, tell me
>your little sister's age
>her interests
I am a femanon with little brothers so your post really made me feel like I need to help you.
But honestly, I would start off with classic SOL titles like K-on for starters if you really want to weebify your little sister (which i wouldn't, considering how cancerous the current normie anime community is, and anime in general tbf, unless we are talking about old stuff and manga).
Much love!