Prequel vignettes to the Kemurikusa TV series released on Tatsuki's official Twitter. They have an irregular episode count as follows: ep 0 (actually unnumbered), 0.5, 0.6, 0.7, 0.8, and 0.9.
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After the Kumurikusa TV series finished airing, Tatsuki released another vignette the following week numbered ep 12.1 both on his Twitter account and official YouTube channel.

The science-fiction action story follows girls who fight with weird entities nicknamed "mushi" (bugs) and survive in a world of red fog. 
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(Source: Anime News Network)
Based on Tatsuki's winning entry from the '24th 3D Anime Contest' in 2012 of the same name.

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