This Is Screwed Up, but I Was Reincarnated as a GIRL in Another World! (Manga) Vol. 2

Ren was once a scientist--and a man--in our world. Now she's a healthy young girl with magic powers and all the knowledge of chemistry and physics of a modern adult genius! She's tamed a mother wolf and pup, and is living out her days in cheerful isolation when some strangers knock on her door, demanding help with a deadly plague! The answer is a simple one, but it's going to make life very complicated for Ren when a young man keeps sniffing around, hoping for a closer look...