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For reference, the dictionary definition of the word "pinto" is

Marked with spots of white and other colors; mottled; spotted.

It can also be used to refer to a piebald horse which has irregular patches of two colors such as this one: Piebald Horse

Jorge Luque
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1

My guess is that "Jack" is a reference to "Jack the Ripper" because in the OVA, the main characters are chasing a serial killer. It could also be a reference to "Jack-o'-lantern" since the serial killer wears a pumpkin mask and is referred to as "Lantern".

On the other hand, the only two things I can come up with for Pinto is that it's a reference to (spoilers ahead):

1

The hidden bruises on the elderly patient which look like the spots of a piebald horse. The patient's skin was thus like a "pinto" horse.


2

The dual personalities that the nurse had because "pinto" could mean the she had spots of white (good) and black (bad).


I think theory #1 on the elderly man is more likely to be right than the nurse theory.

Jorge Luque
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  • Stop answering your own question for reputation. – GK A Oct 22 '18 at 11:51
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    @GKA there's nothing wrong with [self-answering](https://anime.stackexchange.com/help/self-answer), provided that the question and the answer have its own merit. Also, I was the one who suggested OP to put his theory as the answer because it is *one of the possible answer*, and so it can be voted accordingly. And there's nothing to stop anyone from providing a better/official answer to this question. – Aki Tanaka Oct 22 '18 at 12:55
  • Oh.Thats weird.I did not know you could answer your own questions.Anyway thanks for telling me) – GK A Oct 23 '18 at 06:47
  • @GKA I originally posted my answer as part of the Question Description in a previous post but AkiTanaka explained that it made more sense to post my own theory as an answer so that the question could stand on its own. BTW, I did wait for others to answer before I posted my own answer. I also googled other theories but found nothing. – Jorge Luque Oct 26 '18 at 07:09