Momoko, who attends a special school, is both mentally and physically disabled. Every morning she becomes peevish because she can't go to the ordinary school with her twin brother Riki. Her family soothes Momoko by singing her favorite song "The Song of Frogs." One day, Momoko shouts encouragement to Riki who's playing dodgeball at an open classroom day and Riki's team wins the game. Ryuji, whose team lost the game, is not impressed and demands that Riki stop bringing his 'idiot sister' to school. Riki totally loses control and hits Ryuji with all his might. The following year, an experiment in integrated education is implemented and Momoko begins to attend Riki's school. Unfortunately, her physical condition takes a turn for the worse and she's sent to a hospital. Riki and all her classmates want to cheer her up and they set a goal of winning a relay race so that they would be able to tell Momoko the good news. Meanwhile, the fastest sprinter, Ryuichi, insists that he won't be taking part in the race.

In the story, the seasons have changed and it will soon be the second spring. Tatsuya and Miyuki have finished their first year at First Magic High School and are on their spring break. The two go to their villa on the Ogasawara Island archipelago. After only a small moment of peace a lone young woman named Kokoa appears before them. She has abandoned the Naval base and she tells Tatsuya her one wish.

(Source: ANN)

According to the Kuroshitsuji website, there are 6 OVAs included in the DVD releases. DVD 2: Ciel in Wonderland (Part 1) This re-imagines the cast of Kuroshitsuji II as characters in Lewis Carroll's Alice in Wonderland story. DVD 3: Welcome to the Phantomhive's This is meant to be like a simulation game. Elizabeth invites a lady (perhaps the viewer) to join her at a ball held at the Phantomhive mansion. DVD 5: The Making of Kuroshitsuji II This is a Hollywood style documentary with behind the scenes interviews with Sebastian, Ciel, Claude and Alois etc. DVD 6: Ciel in Wonderland (Part 2) This re-imagines the cast of Kuroshitsuji II as characters in Lewis Carroll's Alice in Wonderland story. DVD 8: The Tale of William the Shinigami William and Grell have to train new shinigami and reminisce about when they were training partners. DVD 9: The Spider's Intention The life in Trancy household and how those work under Alois is caring for him.

Special episode bundled with the 9th volume of the manga based on Chapter 57-59.