She definitely doesn't belong in the society with her approach of burning everything first and then healing innocent victims. Though she is kind and very easygoing when not in the fighting mode.
Suddenly isekai? Why tho?
That's probably the most convenient way for the author to justify speedrunning the introductions of our world's recipes, cooking techniques, kitchen equipment, etc.
Looks like MC doesn't have perfect recollection of his previous life, maybe never will, so these flashbacks are going to be giving him new ideas and have him say strange figures of speech not even he understands, like the Kiyomizu one.