Black Butler

Kuroshitsuji also known as Black Butler is a manga series and an anime.

Plot
In a manor house on the outskirts of the Victorian era in London, butler Sebastian Michaelis serves Ciel Phantomhive, the head of an English noble family as well as a toy, food, and candy empire, Funtom Corporation. Sebastian obliges to any task required by his master and solves the problems plaguing England effortlessly due to his demonic lineage and Faustian contract with his master.

Het

 * Cielizzy - the ship between Ciel Phantomhive and Elizabeth Midford
 * Grelliam - the ship between Grell Sutcliff and William T. Spears
 * Sebamey - the ship between Sebastian Michaelis and Mey-Rin
 * SebaGrell - the ship between Grell Sutcliff and Sebastian
 * Undergrell - the ship between Undertaker and Grell Sutcliff

Slash

 * Cielois - the ship between Alois Trancy and Ciel Phantomhive
 * Sebaciel - the ship between Sebastian Michaelis and Ciel Phantomhive
 * Seballiam - the ship between Sebastian and William T. Spears
 * Soni - the ship between Soma Asman Kadar and Agni

Fandom
AO3