My Fictional World Has a Lot of Problems

I transmigrated into Kyosuke Kosaka and got a younger sister named Kirino Kosaka. I thought I could finally enjoy a peaceful everyday life.

But on the very first day after transmigrating, I found a cursed videotape among my younger sister's things. She's beautiful and gets excellent grades.

And Shino Kasumigaoka, a bestselling light novel author in the same grade, suddenly started coming to school on tiptoe.

And what's with my childhood friend being replaced by Tomie?