I love the inner turmoil of each replica and the way each of them seemingly have completely different "lives", if we can call them such, but there is a fundamental issue my brain can't seem to avert its attention from: the concept of "replica" isn't explained at all.
Sure, each one of them is born from their owner's desire to avoid something unpleasant, but it's a very weak premise we're forced to put up with/accept as-is. In other words, it's like the premise used in most isekai stories: you have to accept the fact that reincarnation/transmigration is a thing, no questions asked.
If only one person had such a power, you could still justify it as that single person hallucinating or being special, but it seems to be such a wide-spread ability that the lack of any public recognition of replicas is almost... weird? Like, if you were Mori's parent, wouldn't you try to understand what's going on instead of calling the replica a "monster"? We're talking about a reality-bending concept and it simply gets written off as "you're a monster"???? Surely I can't assume her parents understood everything and still decided to call her a monster... right?
Anyway, ignoring the barely-standing premise, the human drama hits just the right spot.