"Then come over and kiss my brother."
"Why are you always looking at me? Why, are you obsessed with me?"
Can you imagine these words coming from the mouth of an introverted high school student who is considered a good kid by his teacher?
Normally, he can't even tolerate making a small mistake and would blush when he accidentally touches a girl.
What happened that caused such a good student to turn into a sinister brother who talks sweet words but has no blushes or a heartbeat?
Concept: Fate is a wonderful thing