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X Sliding In (Japanese: すべりこむ○○シリーズ, Suberikomu Marumaru Series) refers to a series of hand drawn animated videos of characters sliding into a cardboard box, mimicing Maru the Cat, while playing the Kyu! Kyu! Kyu! Nya~! dance song in background.
On July 21st, 2009, Nico Nico Douga (NND) user 柳～やなぎ～ さん uploaded a video titled Chen Sliding in (すべりこむちぇん) (shown below, left), where Chen, a catgirl character from the Touhou Project, is sliding through a box in a similar manner to one seen in the August 2008 Maru video “滑り込むねこ。” (shown below, right). In making the video, 柳～やなぎ～ さん used the same music from the 2008 video game Monster Hunter Freedom Unit that can be found in an older NND fad Kyu! Kyu! Kyu! Nya~! Dance.
One of the first sites to cover the fad was 初音ミクみく(Miku Hatsune Miku), a Vocaloid blog, on August 1st, 2009. Over the next several months, the fad was also discussed on personal blog 吾唯知足？, Pokemon blog ポケモンしちゃうのか！？ and encyclopedia site Pixiv. After a discussion thread that began on August 2nd, 2009, すべりこむ○○シリーズ was added to the Nico Nico Douga Dictionary on July 30th, 2010.
As of August 2012, there are 363 videos tagged “すべりこむ○○シリーズ” (slide series) on NND and 39 videos on YouTube. The thematic elements range from Touhou compilations, Byaaah! So Yummy and Diglett Underground to Leaked Senkaku Video, Vocaloid compilation and Hakuouki among others.
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