It can also translate to 'I am a demon and a butler'.

The phrase plays on the word 'demon' ( あくま akuma ?) and the phrase 'to the end' ( あくまで aku made ?). Sebastian often describes himself through the phrase 'I am nothing more than a butler.' ( 私はあくまで執事ですから Watashi wa akuma de shitsuji desu kara ?). Sebastian's appearance is similar to that of Ciel's father. Sebastian Michaelis ( セバスチャン・ミカエリス Sebasuchan Mikaerisu ?) is the very attractive butler of the Phantomhive household and acts as Ciel's bodyguard.

Until the terms of their contract are met, Sebastian must keep Ciel alive. Sebastian serves as the Phantomhive butler. He is helped by Sebastian Michaelis, a demon bound to Ciel's will by a contract. Ciel is tasked with solving problems plaguing London under Queen Victoria's orders. Under his lead, the company grew into a major corporation. Twelve-year-old Ciel Phantomhive is the current head of the English Phantomhive noble family and the Funtom toy and confectionery company.

Black butler season 2 timeline