This is screwed up, but i was reincarnated as a girl in another world! (manga) vol. 10 - ashi

In this isekai tale, a male scientist from Earth is reborn as an orphan girl in a world of swords and sorcery.

Ren is a young girl in a primitive world of magic and brutality.

Sold as a slave and about to be delivered to an unscrupulous merchant, she suddenly awakens to vivid memories of a past life: a world called Earth, where Ren was both a grown man and a research scientist.

Now, she must learn to survive, combining her knowledge of science from her past life with her talent in magic from this life.