Virtual reality technology has been around for decades, but it has only become affordable for consumers in recent years. The release of VR hardware such as the Oculus Rift, HTC Vive, and PlayStation VR have provided consumers with an inexpensive entry point into virtual reality. And of all the different industries exploring VR, from music to film to pornography, the gaming industry is its public face. This year’s Tokyo Game Show was heavy on VR software, and it is a sign that VR will revolutionize the future of gaming.

Adult games, however, are being left behind. Adult content is often banned outright at mainstream gaming conventions in Japan, and creators of such content lack avenues to bring their games to a wider audience. But if the actions of some of the gamers at this year’s Tokyo Game Show are anything to go by—a booth was shut down due to people groping a mannequin that became an anime character when seen through VR headsets—there is an audience that is at least curious about seeking out such content.

Adult VR No Kai is interested in exploring that curiosity. Earlier this year, the group organized the first adult VR festival in Japan. They held the inaugural festival in June, though the event was quickly called off due to overcrowding. The street outside the venue in Akihabara was overwhelmed with people wanting to catch a glimpse of VR porn for themselves, and the world took note; international media covered the story, ascribing the situation to Japan’s inherent quirkiness.

The collective successfully ran the festival later in August, and have since traveled around the country hosting similar events, most recently in Sapporo. And at these events, as was the case with that one Saturday in October, people’s attention invariably turns to one game in particular: Let’s Play with Nanai!

Roba and Kaicho (members of Adult VR No Kai who prefer their online handles to their birth names) developed the title. The reason why the game attracts interest is because there aren’t many games quite like it—about that Kaicho is sure. What makes this game unique was an idea Kaicho had when he first experienced VR porn himself, just over a year ago. “When I first watched porn in VR,” Kaicho said, “I wondered how people got themselves off, having to hold controllers in their hands.”

The game is simple. It’s played by wearing a VR headset, which transports the player to a bedroom. Once there, the player is greeted by Nanai, a slender, pink-haired anime character. But instead of using controllers like most VR games, Let’s Play with Nanai! blends physical reality with virtual reality by using surrogate bodies. A smartphone is attached to a surrogate body that controls Nanai’s movements, allowing the player to have seamless interactions with Nanai in VR. Information is relayed between the smartphone and the computer, and the position of the surrogate correlates with Nanai’s. Kaicho says that anything can be used as a surrogate, from sex dolls to actual human beings. “A fan of our game used his wife as a surrogate to have sex with Nanai,” said Kaicho. “He was happy, but his wife apparently wasn’t too thrilled.”