I'm that Umino guy

Sasha Sumitra is a content middle-aged woman, surrounded by her numerous cat pets and haphazardly hung picture frames. Until one day, she dies. Thrown into the body of Iruka Umino from a manga she remembers from hazy, half-forgotten, half-made up memories; she hasn't the faintest clue of how she'll survive this world...and what's that about teaching kids how to kill people?