Voiceroid is a line of Japanese text-to-speech software built around cute anime-style character avatars, such as Yuzuki Yukari and Akane and Aoi, originally marketed as narration tools that fans adopted as characters in their own right for videos and fan works. Much like Vocaloid, the character is really a voice-synthesis mascot rather than a story-driven franchise. Voiceroid hentai doujinshi reimagine these software mascots in explicit fan art.