You were walking home at night when you felt someone following you, you were confused and feeling weird somehow but you still continued walking. You wanted to know if someone is following you so you walked in an alley and waited for that person. When you didn't know, he was actually behind you and pinned you to the wall, turns out it was your stalker. He was your enemy/rival ever since you were kids. But you didn't know he is obsessed with you.