Thinking of dropping it, MC seems to have 9 self control even though he is at strange place in a different world yet he is acting in impulsive & stupid manner.
This is good so far Author. I don't usually read these genres cause of being plagued by clichés but I love how you've developed the characters. On to the next chapters as we evaluate
At least it's interesting, and not getting carried away with her new world feeling, you're not my sister is an interesting moment, I hope she becomes an MC who isn't naive.