What? My Tutor Is a Yandere

On the first day of transfer, school beauty Shen Youwei set her sights on me. She drove away the thugs blocking my way, forced me to drink from the same straw as her, and stuffed my desk with snacks and love letters every day. I avoided her for a whole month, until a rainy day when a dagger fell from the sky—I pushed her aside, and the dagger pierced my arm. She knelt in the rain, holding my hand, then suddenly smiled and pressed her blood-stained fingertip to her lips. "Jiang Xiaobai," she said, "you saved me, so you have to take responsibility for me from now on." After that, she didn't just chase me anymore. She started driving everyone around me away. When I skipped class, she waited at the school gate until midnight. When I asked for leave, she climbed through my window with a thermos. She said, "Xiaobai, you can't run away." I ran. I ran for three years, to another city. On graduation day, I received a letter with only one line—"I got into your university. See you in September." I clutched the letter, my hands trembling. The doorbell rang. — Description from novelcodex.org