Ryuuichi Kaizu, intelligent, ambitious, and dedicated, but at the same time cunning and immoral young student receives present from girl Emi Naito, who comes from wealthy family. Realizing that being in relationship with her can help him reach his goals, he decides to make her his, without her even being aware she is just another woman he is using.

A recap episode of episodes 1 through 10 of Kekkai Sensen. Leonardo Watch reflects on his experiences at Libra.

The anime illustrates how the three protocols/standards handle a request (an online video purchase) from the user by handing off packets of data between them.

At the behest of the Queen, Earl Ciel Phantomhive hosts a lavish dinner party attended by several of the finest members of polite society—as well as struggling author, Arthur. But as the party reaches its high, a terrible murder takes place and none other than the Earl himself is suspected of the crime. As a violent storm rages on outside, the death count continues to climb. The Phantomhive household and their eminent guests find they must cooperate in order to solve this mystery before they too fall prey to the mysterious murderer. However, it seems that not even the perfect butler, Sebastian Michaelis, is safe from this horror.