In addition to the Maya thing, there are other hints that people are still around during resets, just invisible. HOPE implies that not everyone disappeared during the first reset:
Similarly, Maya implies that Kumon-mi doesn't change during the reset, only Sensei's perception of it:
I like to imagine all the nameless people are just going about their lives as normal during resets and have to watch the crazy man do things like fuck a watermelon and have a naked dance party in the street.
I do think Ami is probably a special case given she remembers more than she should even when it's not a reset. Imagine if on top of her childhood trauma, she has to live with memories of her insides disintegrating every few months for thousands of years.