I can't be sure, [he admits with some apparent unhappiness.] We seem more consistent and resilient than the locals, but our memories and personalities can be tampered with as well. I experienced the latter for a few hours, myself.

[What he doesn't say: he hopes the him speaking to Koharu is nothing more than a copy of his true self. But then he's not particularly attached to his life so much as his goals.]

But that could simply be the result of the system's ability to connect to our minds in some fashion, rather than indicating a lack of a body.