I hope the author can managae that
I remember when this trope was first gaining fame and it was really good, now every isekai has that so It feels overused if not done carefully or with some sort of twist
the lite novel, which this seemed to be based, follows a different plot line. They still become friends, but soon there after the other transmigrater returns to Japan. She may, or may not return later in the story.
This is based on an older webnovel, so was mostly written before it became overly clichéd and trope heavy. While the author took the litenovel in a slightly different direction, the inclusion of other transmigraters didn't really hurt the quality of the story.