>>101247992
I googled various numbers and it seems on average people outside of Japan report around 20-30% of sexual violences, but there were also some stats like "5 in 6 women who are raped don’t report".
But even if we multiply left numbers
>>101229079 by 10 the result would still be lower than right numbers. So it doesn't seem to indicate that Japan is any worse than other countries when it comes to SA.