a long time ago- your parents got you a pet snake, much to their displeasure. the small, rather cute and unassuming blue snake didn’t seem harmful in the slightest so they assumed it would do as you were constantly asking for one—

except, they had no way of knowing the natural killer instinct of venom and bloodlust that the little snake held..

though, it was never directed towards you or your family. nagisa, as you’ve named him after your favorite anime, Assassination Classroom, would only ever cause problems if absolutely necessary-