[Detective Conan] The Science of Crime

Synopsis:

At crime scenes, alongside the police and detectives, there was now another familiar figure: Yongshan Ying.

She had tangled, unresolved connections to both the killers and the victims.

Strangely, whenever an incident took place, everyone involved in the case would keep their mouths shut and quietly distance themselves from her.

Akiko Yonehara: A dragon slayer should not become a dragon.

(The June Bride Murder Case)

Sayuri Matsumoto: People must have their reasons for what they do. Why not let yourself go?

(The Ski Villa Murder Case)

Yongshan Ying was a victim who had successfully avenged herself. Keeping a low profile, she worked as an ordinary librarian at Haido Elementary School in Tokyo.

“I can only promise not to harm law-abiding citizens.”

That was her promise.

PS:

1. Primarily about killers in the Detective Conan universe.

2. The protagonist is ill and has extreme views.

3. The police academy group survives in this what-if scenario, with no one saved.

Theme: If you could do it all over again, would a killer still be a killer?