The official website of the Shiki television anime series confirmed on Saturday that the anime's eighth and ninth Blu-ray Disc/DVD volumes will each include an unaired episode. The eighth volume will ship with Episode 21 and the unaired episode "Dai Futatō to Han wa" (a wordplay for "Episode 20.5") on May 25, 2011, while the ninth volume will ship with Episode 22 and the unaired episode "Dai Futatō-ichi to Han wa" ("Episode 21.5") on June 22. (Source: ANN)

Chise is an ordinary schoolgirl: small, frail, and not particularly intelligent. Her greatest joy is her budding romance with her classmate and childhood friend, Shuuji. They both live in a small military town in Hokkaido, where high schoolers have few concerns other than who is dating whom and complaining about the steep climb up "Hell Hill" every day before school. One day, Shuuji and his friends make a trip to Sapporo to buy gifts for their girlfriends. A massive air raid on Sapporo that day kills thousands, including one of Shuuji's friends, and signals the beginning of a war. Fleeing from the carnage, Shuuji spots Chise, though now she has steel wings and a massive gun where her right arm should be. Against her will, she has been transformed into the ultimate cyborg weapon, capable of leveling entire cities. As the war rages closer and closer to their hometown, Chise and Shuuji's relationship is strained by her transformation, and they are left to wonder whether she is even still human. [Written by MAL Rewrite]

In front of a camera, roommates Mao Tsuchiya and Hisashi Ootomo make three promises: Mao must not tell anyone Hisashi is gay and in a relationship with another man; Hisashi must never fall in love or make any advances on Mao; and one must not disturb the other's "personal time." Thus begins their second year of cohabitation. However, everything starts to crumble when the film club—of which Mao is a member—wants to cast Hisashi in the lead role for their upcoming movie. The problem arises with the movie's plot, as it is about boys' love—a romance between a delinquent and the class president. Mao is adamant to dissuade Hisashi from becoming the protagonist due to their first promise; but, to his surprise, Hisashi is easily convinced by the director. After imagining Hisashi as the delinquent he is playing, Mao becomes overly conscious of his presence. He knows Hisashi is just a friend and out of his reach, but Mao cannot keep lying to himself anymore—his feelings toward his roommate may no longer be purely platonic.

As the season changes from spring to summer, Makoto Yuuki remains alongside the Specialized Extracurricular Execution Squad (SEES). The team continues to defeat Shadows large and small, but they now clash with a new enemy: Strega, a group of rogue Persona users who wish to keep the Dark Hour to their advantage—it seems that Strega may hold a clue to the Dark Hour's true nature. While SEES enjoys summer vacation in Yakushima, they are joined by Aegis, an amnesiac android designed to destroy Shadows. While she proves herself to be a powerful ally, she is inexplicably drawn to Makoto and constantly remains at his side. As they delve deeper into the mysteries of the Dark Hour, the nature of the mysterious connection that binds these two together is slowly unveiled. [Written by MAL Rewrite]