What do you mean some doubts?
Yes! There are two endings! Ultimately, this is how I see these things:
In one of them, presumably, they will be able to meet, but they live in a very dark, dangerous world, so their fate might ultimately be very bittersweet.
In the other, they will never meet, because Nano escaped from that dimension into a perfect world, which may or may not be an illusion created just for her, and she will live a long and happy life, while Ngazi will be fighting against the terrifying Watchers.
Thank you for reading!