My Little Sister Became a Yandere, and She's Driving Me Crazy

(Campus life + yandere + love rivalry + witty banter + no villains) Who comes out on top, the girl he never forgot or the yandere? Wang Zihui used to be a delinquent. In middle school, he accidentally saved a girl named Su Yan, and the two began a sweet, wonderful chapter together. That lasted until Su Yan transferred schools in high school. Wang Zihui fell into a slump and returned to his old ways, skipping his studies, until Lin Longxi became his salvation. For Lin Longxi, Wang Zihui worked hard enough to get into the same university. He thought they could finally be together and settle into a peaceful life. But Su Yan believed Wang Zihui had betrayed her. Now she has returned as a yandere.