Mona, a shy schoolgirl, discovers her new virtual reality game, Koikatsu, and can't resist exploring its naughty possibilities. She dons her school uniform and steps into the game's world, where she encounters a charismatic teacher with a wandering eye. He seduces her with his smooth words and roaming hands, leading Mona to experience her first virtual, yet intensely real, orgasm. She's hooked, and her appetite for kinky encounters in the game world grows.