Charlot123
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The theory about OCD is quite intriguing. OCD is often associated with ASD, and outbursts of violence are commonly linked to OCD. Worth considering, imho.
Regarding the sand, it’s my understanding that the small bum bag was purchased a couple of years earlier in Tokyo. My hypothesis about the sand in the bag points towards the fishing industry and cash transactions.
If the killer was involved in a family fishing business - either a shop or a fishing enterprise - he would likely have been cutting fish and selling part of the catch for cash. This could suggest a small, family-run fishing operation where customers could buy fresh fish. Handling fish and cash in such an environment would naturally lead to sand transfer. The sand could have adhered to their hands during fish processing and subsequently to the cash.
The presence of only two types of sand suggests that the activity was localised and narrowed down to certain area, with the fish being caught, unloaded on a sandy surface, and then moved to the market. The bum bag was primarily used to store cash, so it’s plausible that the killer handled banknotes with sand on them.
The sashimi knife, the fish cutting technique, the sand, and the sweater with DIVE written on it - all these elements fit the profile of someone associated with fish or fishing. My intuition tells me that the killer was likely a fish handler, well, at least part-time. He vanished just like a fish slipping away. JMO.
Did Japan invite migrants to work as fish-handlers, periodically? I wouldn’t be surprised if it was seasonal work.
Another option, is there any famous fish restaurant at Miura coast where the Miyazawas spent one summer? The guy could be a chef but more likely, a waiter.