"Episode.0" is the thirty-ninth single released by Japanese solo artist Gackt. It was released on July 13, 2011 by HPQ. It became the thirty-ninth Gackt's consecutive single to reach top ten on Oricon's singles chart, a male soloist record for most top 10 charts singles. The single debuted at number three on the Oricon chart, selling 28,643 copies in its first week, and charted for six weeks.
"Episode.0" and "Paranoid Doll" are the two Vocaloid songs that were previously picked by Gackt in a Nico Nico Douga fan video contest in 2009, with the prize being 10 million yen (US$120,000). Gackt said he would cover those songs if the staff were committed to making it a reality, and so after two years the songs were officially recorded and released.
The music video was an upscale version of the original vocaloid video produced by the winner of the Nico Nico Douga contest. It was entirely shot using a professional camera and the entire video is composed of thousands of pictures edited to make it seem like a moving image. Gackt himself said that shooting this video was a challenge because of the exact movements needed to achieve the desired effect. The video tells the story of a samurai who in the beginning was bloodthirsty and wanted nothing but fighting. Then as the video progresses it is revealed that he gets impaled by a katana and he starts dying. The lyrics reveal that towards the end of his life he feels remorse for what he has done and remembers a song that a little girl has sung. It reminds him that peace is greater than war and towards then end he dies. Before dying he says: "If I were able to take someone's burdens away as mine are taken now, Ah!" and dies. The whole video describes how peace is greater than war.