1987, Tokyo, summer.
Seventeen-year-old Misaki Fujiwara is an ordinary high school girl. She has four best friends from different countries, a bedroom filled with mystery novels, and a dark secret.
One rainy night, she "accidentally" witnessed a murder near the old school building. As the body lay in the mud, she called the police, her voice trembling and her words incoherent.
"I didn't see the murderer's face."
As a result, she became the only witness in the case and the most trusted witness by the police.
Everyone believed her.
Only she knows——
Every word she said was a carefully crafted lie.
And this lie is just the beginning of all lies.
Because when the police followed the "clues" she provided to investigate step by step, they would not have thought that the murderer they were chasing was sitting in the police station's interview room at the moment, looking at them gently, cooperatively, and innocently as a witness.
"I didn't see the murderer's face."
——Because she is the murderer.
And the man who died on the rainy night owed her more than just his life.
This is a story about a "victim" killing a "perpetrator".
It is also the story of a girl orchestrating a perfect crime in the abyss.
You've been reading the murderer's diary from the beginning, you just didn't know it.
Intent: When the law cannot touch sin, what will justice look like?