That Girl Has Sharp Teeth

Lethe is a teen girl with a secret, she's a cannibal and maybe possessed by an entirely different species, but she never really minded, she is chill with it, and she has a talent for making people simultaneously disappear. she kills people for a living

When Lethe finds a young amateur female detective on her tail she can't help but wonder if she knows more than she lets on.
With that Lethe and and the amateur detective look into a string of mysterious missing persons and Lethe can't help but wonder if it's has any connection to her past and current state as a monster .