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Infiltration Gachi coverage! A certain forbidden top secret spot in the underground of the big city, beasts covered with wriggling carnal desires! Infiltrate the rumored underground playhouse! …Swapping orgy party held several times a month by a couple whose life is SEX. Sex YES, children NO! It is said that it costs ○ ten thousand yen just for monthly rubber fee. Would you like to take a peek into the world that ordinary people cannot understand?