I Learned the Demon Eyes and Discovered All the Girls Around Me Are Yandere

(No poison, no landmines: a bizarre, funny, yandere harem story with multiple heroines. Everyone is pure, inexperienced, and devoted to the hero.)

Fu Zixian develops a fever and awakens fragmentary memories of his past life, gaining a wealth of knowledge about magic. After a whole year of diligent study and grueling training, he finally masters the Demon Eye.

The strongest male high school student in history is born!

But on the night he officially tests the Demon Eye's powers, he suddenly detects a familiar girl near his room.

She's a terrifying monster that even the knowledge from his past life can't identify.

P.S. This story has a System, and that System is the Demon Eye, which the male lead designed for his own amusement.