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Set in the year 2039, Japan is the under the rule of a multinational military force called GHQ after the country went into chaos due to the "Lost Christmas" incident ten years prior to the start of the series, when a giant outbreak of an alien virus called the Apocalypse Virus spreads during Christmas, causing the United Nations to send the GHQ to contain the outbreak and restore order. The series follows Shu Ouma, an intelligent yet socially awkward teenager who finds himself caught in the war between the GHQ and "Funeral Parlor (Undertakers)", a resistance organization led by Gai Tsutsugami, which aims to liberate Japan from the GHQ, when he meets Inori Yuzuriha, the famous Internet Singer of the band Egoist and a member of the Undertakers. Due to various circumstances, Shu acquires a genetic weapon called the Void Genome, also known as "power of kings", which allows him to extract "Voids", objects with special properties that reflect the personality of their owners from underage individuals. With his new powers, Shu joins the Undertakers to protect Inori and learns secrets and mysteries he never knew.
The anime aired on Fuji TV's noitaminA program block from October 13, 2011 to March 22, 2012. The first opening theme song from episode 2 to 12 is "My Dearest" by Supercell with vocals by Koeda and the first ending theme song from episode 1 to 12 is Departures ~Anata ni Okuru Ai no Uta~ (Departures ~あなたにおくるアイの歌~?, lit. "Departures (Send your Love Song)") by Supercell under the name Egoist with vocals by Chelly, the fictional band within the series. The second opening theme song from episode 13 to 22 is "The Everlasting Guilty Crown" by Egoist with vocals by Chelly and the second ending song from episode 13 to 21 is Kokuhaku (告白?, lit. "Confession") by Supercell with vocals by Koeda.
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