[Crossover] My Younger Brother and Sister Really Do Have Issues

My name is Dai Chihiro. I love light novels, have an almost nonexistent presence, and am an ordinary high school senior living a peaceful life. But all that peace was shattered by an underclassman. "I've got my eye on you." And just like that, I joined the basketball team. Of course, getting some exercise now and then is perfectly normal. Unfortunately, after the Interhigh ended, my younger siblings returned to their home country, and my life suddenly began racing off in a bizarre direction. Crime scenes, supernatural powers, shikigami, monsters, ghosts... All sorts of strange things started appearing in my life one after another. It turns out my younger siblings really do have something going on. But I really just want to get into a good university. Worlds featured: The Prince of Tennis, Kuroko's Basketball, Air Gear, The Disastrous Life of Saiki K., Detective Conan, Sakurako's Investigation, Natsume's Book of Friends, modern-day onmyoji, modern-day Demon Slayer, Yuri!!! on Ice, Vampire Knight Content warnings: 1. A lighthearted, everyday-life comedy with lots of snark. 2. Dai Chihiro will change, since his experiences are different. 3. The characters probably won't awaken supernatural powers. 4. The younger siblings are meant to be overpowered, so don't get hung up on whether their abilities make sense. 5. Cross-dressing men and women will appear. Theme: Lighthearted everyday life