It's not hard. Beware of the cute ones, they are the most deadly of all.
I'm a vampire, you know?Book 65: A Vampire's ContractFrom the artist's Pixiv page.I could kill a little devil like you easily.I'm still young, you see...But I won't kill you now.Do you understand why? Because there is a contract.But if you want to revoke it......then it won't matter if I break it at any time, will it?