Black Butler (Kuroshitsuji) was first released in manga written and illustrated by Yana Tobos. Then, Black Butler was also released in anime series.
First Season, Kuroshitsuji – the main characters, Ciel Phantomhive as the head of the Phantomhive noble family and Sebastian Michaelis (a demon) as the Black Butler who served Ciel.
Second Season, Kuroshitsuji II – with 2 new main characters, Alois Trancy and Claude Faustus, following the aftermath of the first season. The 2nd season was the anime’s own adaption and was not feature in the manga.
A third anime series, which titled Kuroshitsuji : Book of Circus, was also released in Japan from July to September 2014.