Cool Devices is a series of animated hentai pornographic videos released in 1995. The series consists of eleven episodes referred to as "operations" and is most noted for its very extreme sexual content, most of which center around BDSM and similar fetish themes. Cool Devices is notable for its excellent production values compared to other hentai titles at the time. The series was licensed in North America by Nutech.
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Operation Yellow Star (イエロースター, sometimes イエスタ for short)
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