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A pornographic RPG from Japan. Zettai Reido means 'absolute zero' in Japanese, but it rearranges the characters for 'slave (Do-rei -> Rei-do)' to make the title into a pun that means Absolute Slavery. The marketing copy describes it thus:

"Zettai Reido is an over-18 only TRPG rulebook made just for those who like Devil Girls, Non-Human Girls, and Tentacles!! Includes never-before-scene(sic) situations like playing a demon family in the demon world."

Hilariously, the name "Zettai Reido" was first used by a popular Yaoi manga magazine. Justified by the sheer amount of futa love in the game

System

Unknown. Zettai Reido is written entirely in Japanese, and only a partial English translation is available. What is known is that it has a GM, HP, and MP, suggesting a system similar to D&D or console RPGS, and the rolling conventions are all in d6's, most likely due to the impossibility of obtaining polyhedral dice in Japan. A FATAL-like system apparently exists, determining how much one's anus can take.

Setting

Unknown, presumably some sort of fantasy and/or demon world. What has been collectively gathered is demons in hell have a insane sex drive and nothing better to do than bone. Everything has a penis and is 12 years old. If in the event something in hell lacks a penis, there are plenty of ways for something to give it one. Oh, and demons quite commonly fight with each other over who gets to give and take the entrance of said penises.

The book depicts a number of different races:

Asura
Devil
Seraph
Cenobite
Lamia
Undead Spawn
Succubus & Incubus
Vampire
Dark Elf
Ogre
Scylla
Dark Knight
Beast
Black Goat
Balrog

According to /d/ the illustrations of these are contributed by a variety of noted hentai artists.

ZR on /tg/

The lack of an English translation has prevented any substantial amount of lulz that might otherwise arise from this work. However, in a effort to save teh lulz brave /b/tards have deciphered enough moonspeak to tell the legend of a demon raping a plant that grows cocks on anything its spores touch. yes rly. /d/ recently began an effort to extract and translate the content, and have begun to proof and enhance the translations.