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Parody opening for a spin-off of Mahou Shoujo Madoka Magica, starring the characters from the upcoming visual novel game SoniComi by Nitro+. This was released by Nitro+ as an April fools' prank, complete with an official website announcing a full TV series.

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Released as an April Fools prank in 2014, later included in the Blu-ray/DVD release of No Game No Life.

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2017 April Fools' Day event where Nitro+ mascot Super Sonico is becoming an Ultraman-esque superhero, "Ultrasonico."

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According to Aniplex, a 10min short anime of Gintama "Shiroyasha Koutan" will be released on September 30th. It was shown at Jump Super Anime Tour 2008 and had never been released as a DVD. It's a trailer of an imaginary Gintama movie. Gintama OVA shown at Jump Anime Tour '05 is also included in the DVD.