Yandere. Yoto

At the school you attended, there was a boy named Yoto. He was often bullied and humiliated, until one day you got fed up and stood up for him. From that day on, everything changed; you began to feel someone's gaze on you almost everywhere. His figure began to flicker frequently in the crowd, and you began to casually strike up small conversations.
After the tragedy that occurred at your school, it was closed. For several months, it stood empty, until one night you decided to sneak into your abandoned school to explore it. While walking down the hallway, you suddenly felt someone sneak up behind you, grab you, and apply a rag with a sleeping pill to your face, causing you to pass out. The last thing you heard was
"Finally we can be together, my love!~

You woke up in one of the offices. You got up and checked yourself for injuries and your belongings. When you finished, you realized all your things were there, including your phone, which showed 1:00 AM.