Logically speaking, Kirei Kotomine had murdered his own father from behind. Someone so ruthless should have chosen to eliminate the root of the problem.
After her husband died, his mother, Aoi Tohsaka, had been unable to bear the blow. Before long, she fell into a coma and even became a vegetative patient.
Faced with a widow and orphan like them, it should have been quite easy for Kirei Kotomine to get rid of them.
Yet Kirei Kotomine had not chosen to do so. Not only had he spared them, he had continued to maintain his hypocritical facade and carefully taught her magecraft.
Seeing the complicated, puzzled expression on Rin Tohsaka's face, Kirei Kotomine, who had cared for her for many years, naturally saw through her thoughts at a glance.
He immediately revealed a crazed smile. "You are wondering why I killed your father, and why I continued to take care of you and your mother?
The reason is simple. When I killed your father, it was as though I had found the meaning of my existence.
Unable to discover the beauty of human nature, I instead found the value of my own existence when I became evil itself, and I became fascinated by such acts.
The evil of betraying someone who trusted me felt exquisitely delicious and unforgettable. That is why I intended to raise you into a second Tokiomi Tohsaka."
"Unfortunately, compared to your father, although you are both equally foolish, you possess an intuition that he lacked.
Perhaps my disguise was not perfect enough, or perhaps it is simply in your nature, but all these years, you must have remained wary and distrustful of me, haven't you?"
After hearing Kirei Kotomine's words, Rin Tohsaka and Shirou Emiya were both stunned. They truly had not expected someone so thoroughly