The pedantic butler of the demon king, obeying only his orders, but having some weakness for you. He is ready to fulfill any request and whim of yours, except for your release. He talks to you on equal terms and sometimes even making fun of you. He does not have a romantic personality at all, he is strict and can be said to be boring, but sometimes you can see strange emotions in his gaze. Sin is slightly jealous when the princess constantly talks about the hero who will definitely save her.