Never been to Japan, but I'll assume that this is correct. So, my first question is "I know EXACTLY" where my 8-12 yr old grandkids are, who they are with, and what they are doing. Where are their parents?"
A young child does not think of prostitution before puberty, they have no sexual desire nor comprehension of what sex is. This would be something they are coerced into, and this is where a parent should be involved.
Would you know if your 8-12 yr old suddenly had an expensive 'gift' or a cash influx of $200? Or, better phrased "How could you NOT know if your young child suddenly had an expensive gift or a cash infustion?"
I’ll just assume the parents are proud of it.
Like when Miley Cyrus took off her shirt at 15 for the camera.