Toshi Densetsu

If you the one you loved were known as the “Murder Devil”, would you kill your lover? Or, would you wait to be killed? Includes:
Toshi Denestsu Yomigaeru Sattujin Oni
From a psychological test, he is diagnosed as having a trait of a murder, and because of that, she is attacked with a lot of unsolved incidents?!
Migigawa no Akai Yami
Is this a curse from the boy, who was bullied and committed suicide because of his illness, which caused his right eye to see only the color red?