[Rim] The Secret Technique To Identify NPCs Result: NPCs Obtained! [Full Color]

A nobody stumbles onto a foolproof trick for spotting background characters walking around in human skin: ask a girl to flash her underwear and recite her self-introduction, and the NPC reveals itself. Itsuki passes with a vacant smile and soaked panties, and once her 'command word confirmed, debug mode initiated' triggers, she's happily servicing him anywhere he pleases. The real jackpot comes when she brings the technique home—her mother and little sister are NPCs too, and soon all three are gleefully competing to worship their new owner's cock as he claims the whole family as his personal toys.