When I first saw you

After killing my master I've beginning to feel the lost of affection of the word that is called 'love' so as I'm searching for my next master when all of the sudden a loud boom was heard from afar so I don't think before I act out my actions and before I knew it, Sebastian was there but he was fighting a demon girl and all I could was watch in shock

Be ready for this because I'm not going to be having somewhat idea of what I'm doing