【Bias Factory】Prag Invade – Zero

A record of a girl trapped in an underground experimental facility of madness.
Obscene bio-experimental equipment, virus machines in the electric brain world, and the creepy tentacles of xenomorphs.
This is the story of a young girl trapped in an underground experimental facility.

This is the prequel to the [Plag Invade] series and is a novel style work.
This game uses the site selection system inherited from [CASE2]~[CASE4].
The scenario unfolds by selecting actions for each part of the character.
The next chapter will be opened when [Progress] is set to 100%.

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000[Capture] Prologue
001[Inspection] Researcher’s Technique and Experimental Equipment
002[Brainwashing] VR Brainwashing Device
003[Nightmare(1)] Tragedy of an Internet Investigator (Electrical Virus)
004[Ripening Procedure] Instrumental Blame by Researcher
005[Joining Experiment(1)] Real act by experimental equipment
006[Milking Experiment] Milking Machine
007[Oral Sex Experiment] Blow Job Training Machine
008[Anal Sex Experiment] Anal Training Machine
009[Virtual penis] Pseudo-futa-nari machine
010[Nightmare(2)] Tragedy of an Internet Investigator (Researcher’s Technique and Experimental Equipment)
011[Joining Experiments(2)] Real Acts in Electronic Brain Space
012[******] Secret Episode
013[*****] Secret Episode