In New York, Takuya Miura ate a person at least once every two days. Today, these monsters were very familiar with the 'hunting process.'
From this, it could be inferred that these monsters were used to and needed to 'eat people' with some regularity.
Takuya Miura ate his aunt half a month ago, which was the earliest confirmed time.
If there really were hundreds of thousands of these man-eating monsters, that would mean at least a million people eaten in half a month.
What did that mean? That was almost one tenth of the population of Tokyo.
However, the multifaceted system hadn't found any news of people going missing or being eaten.
Thus, there could only be thousands or 10,000 man-eating monsters at most, and they weren't all in the same city.
This number was just a guess, but it definitely wouldn't be hundreds of thousands.