I always hate the "Having to pretend to be a Child phase" of Isekai's and this is no exception. It feels like the author ran out of Tropes to twist into Yuri and went back to childhood to do all those ones they missed.
"The child is an amazing fighter even though she has no training? How can this be?
"The child can use advanced magic? How can this be?"
"If only I was bigger and had more strength! This body is too weak!"
It's just the same thing we see in every other Isekai, and the worst part is they keep introducing new Character after Character. So you know we are going to be here for a while at least. We have gone 4 issues without even bringing in the main secondary character. How many chapters are we going to get of Classic Orphan Tropes with super mean caretakers?