You know typical boy meet girl, they have sex. Girl become yandere, boy is a jerk so he meets another girl but the Yandere girl threatens the girl and boy's friends. Boy want to get rid of the girl as he is afraid of the girl now but girl don't want to leave the boy. Girl meet boy's parent and tell his parent's that she is their son's girlfriend. Now I want a finale with a twist. Any suggestions.
Let say the Yan-Yan successfully kill another girl in front of the boy, and so the boy panic— filled with unending anger and grief— severely injured the Yan-Yan until she fell unconscious. However, as a little bit of affection and sense in him woke him up, he was unable to deal the last blow.
Haunted with both grief and guilt, the boy took the girl to a hospital, where he watched her every day in her coma, slowly yet surely building up his affection for her.
Years after years passed, the man never married or fell for anyone ever again. He kept coming back to his own mistakes and waited patiently for her.
*fades to black* How is it? Very frustrating, isn't it?
Anyway, the Yan-Yan finally woke up, 80 years into the future, and found her 'boy' napping beside her— no, he was not breathing anymore.
Now, this is a real twisted ending. Remember, it's not a tragedy in my book if only a selective group of people suffer.