
Her real name is kiryu nozomi, there’s YouTube vids that summarise her case, it’s very tragic. This work and other adaptations of her life have been made to raise awareness bcuz of the abuse so many children face by their parents unaware that this is not normal like with nozomi. Mothers can be their daughters worst enemy :(

I can’t find the video anymore but you can read this
https://www.tokyoreporter.com/crime/ex-nurse-33-handed-15-year-term-for-murdering-mother-carving-up-corpse/

There’s also this in Japanese if you want they have more detail.
https://blog.goo.ne.jp/tagomago1021/e/f89b9646e67bd88e233e26def1e530c5
And this from the book author
https://www.hayakawabooks.com/n/nff57a3d2e21e
I get so sad reading these types of flashbacks just bcuz we know these children and their innocence won’t be protected in the future. The boy will turn into a monster and the little girl is going to go through so much torture and inhumane treatment thanks to him, it’s just pouring salt into the wounds like damn.