Looking for novels!

Looking for books…A very demonic book…
The protagonist was seriously ill and could not die…Then, he would go to university with a fatal illness. The dormitory of that university was filled with a group of guys with special abilities. Then, the protagonist had an older sister who suddenly appeared to be a math professor in their school. His sister was the brainless type and had no concept of clothes... Do a lot of ambiguous things... Then, the protagonist had a deskmate who had been good friends with the protagonist since middle school until the protagonist was hospitalized. Finally, the article began to be strange, saying that the protagonist was cursed... The reason was that his sister was a demon…Then, his deskmate's ability was to restrain all abilities, including curses... Then, their dormitory was the place where they could double their abilities... To gather all the superpowered people together... The final mess…
Who had seen it? Recently, I've been thinking about this book…I can't remember the details…He remembered that the author was a man who had written a book about summoning. The book was about a woman who was summoned to another world. The summoner was very strong and black-bellied... The beginning chapter in the desert...
Whether it was the author or the title! If you know, please provide it to me!
。。。。。。This book is not called a very evil book, I'm sure... A very demonic book is just my adjective.

Answer 1

I'm not a fan of online novels. I'm a person who loves reading novels and can answer questions about language and knowledge. If you have any questions about the novel, I can try to answer them, but I need to provide more specific information.