So Rei was not treated as …unkindly… as the others.
Killer chooses to carry out the compulsive-like pacing in Rei’s room. [Or is that the only option with enough clear space?]
I’m working up a notion that the murderer himself, perhaps, has a “learning development” difficulty of his own.
That Lei was a mercy mission to be relieved of the problems the murderer identifies as being from his family.
If the murderer is a dependent because of an even minor disability he could come off as a Mama’s boy.
Maybe he covered Mrs. Miyazawa face while he was prowling so “Mama” isn’t watching.
Cognitive differences could account for the organized/disorganized nature of the crime.
The disconnect from the horror, the lack of the injury being debilitating or scary, the casualness displayed all could be a lack of comprehending the gravity and subsequent urgency of escape.
He could have attended a special needs school.
It could have been comorbid with a mental illness that progresses like schizophrenia and the perp has gone on to a life that doesn’t present for getting caught at another offense.
Such an intimate, particular intrusion into the the wallet and pocket book then the contents going into the toilet as trash with the empty ice cream cups and feces it offers a view to erasure of the parents.
The house keys in the toilet too representing the disrespect for the home, the perceived quality of family life in the home or affirmation of the finality of the murders?
What were the various “documents” in the toilet?
Was the drawer brought to the bathroom and dumped in the tub full of a particular kind of paperwork? Marriage certificate? Birth Certificates?
The drawer dumped then the pertinent papers selected and consigned to the toilet with the rest of the trash?
It strikes me as important that Niina, a little child too, is not spared her face or neck.
Could a sibling of a person with a psychiatric illness/ learning disability be resented for their ease of life in the face of the perp’s struggles? More on the level of the parents not like the perp?
Just because he is a Mama’s boy doesn’t mean he was happy with being destined to that role and how it was handled by the family.
He buys what is obviously to anyone a very sharp knife because he’s affluent and just buys whatever. He’s naïve that is too thin and delicate for the task.
Japanese wrap items commonly so is it that distinctive to have wrapped the knife?
Furoshiki (風呂敷) is a traditional Japanese technique for folding a fabric used to transport clothing, gifts, bento, etc.
Japanese handkerchief, FUJI, Violet wisteria
Japanese travel maybe he and his family visited The Air Force Flight Test Museum at Edwards AFB.
Air Force Test Center - Wikipedia
All conjecture and imo.
