きゅうけつ! ～わらわのしもべになるのじゃ～

My name is Tatsuto Asazono, A first-year student at Shibakyu Gakuen. I was living a fulfilling school life, when suddenly one day a girl with silver hair and twin tails appeared in front of me.

Her ass had a tail, and she used magic.
Believe it or not, she doesn't seem to be human.

She called herself Arica and suddenly started sucking my blood. Apparently this is a proof of the contract as a servant , and I'm forced to be her servant without knowing the reason why.