This Kind of Sister Can Only Be Found in the Second Dimension, Right?

"My name is Liu Mufeng. I am an ordinary high school student. I usually study, watch, play games and so on. My life was originally peaceful, until that day..." "My parents came back from other places and suddenly told me that I had an extra sister! And she was 16 years old. I was so confused at the time... Weren't you... So quick? I have lived for more than 10 years and I have never heard that I have a sister." "And this sister... Hiss... What should I say? Silver-pink hair and ice-blue pupils, how does this look like a real person? This kind of sister can only be found in the second dimension!" "Liu Mufeng! What are you talking about there? Come over and take a family photo!" "Oh oh oh, okay, mother... Look, that's it. Although I'm confused, a happy life with a sister begins..." This novel and its characters are purely fictitious. Any similarity is purely coincidental and should not be imitated.