Kuroshitsuji

Synopsis

Ciel and Sebastian visit a festival held on the frozen River Thames. They enter an ice-sculpting contest for the prize, a ring with a slice of blue diamond called the Hope Piece, which is important evidence in an investigation by Scotland Yard into the kidnappings of several young girls. Sebastian creates an ice model of Noah's Ark, complete with animals inside, but the Hope Piece is apparently lost in the river following a bombing incident. Meanwhile, Elizabeth desperately looks for a present for Ciel's birthday. She later discovers the Hope Piece in a toy ship she buys.

(Source: Wikipedia)