The Yandere of the School Beauty "Dies" in Love (Teach Her to Love, and Then Die in Front of Her)

Looking for a Book That Is Extremely Depressing and Depressing. I Hope to Fall into Endless Darkness.

I want to read a book similar to "Genshin Impact: I will fall into the abyss to make my old friend happy (Genshin Impact Ninth Life Reincarnation)".