They can choose between four female models and spend a vacation with them in either Japan or Thailand, joining them on trips to cafes, hot springs and karaoke. So people were very curious," he said. The movie, which stars Japanese porn stars Hara Saori and Suo Yukiko and Hong Kong actress Vonnie Liu, tells the story of a sexually frustrated scholar in ancient China who loses himself in the harem of a duke he befriends. The pioneering 3-D erotic comedy, which opened on 73 screens last week, has taken the Hong Kong box office by storm, beating the first-day record set by "Avatar" and drawing viewers from mainland China as it eyes a global rollout. The name is a Japanese term for obsessive manga or anime fans. Shiu said he believes he has capitalized on a huge desire for 3-D erotic movies. But for those who had spent too long alone in their rooms, a new VR smartphone app offered some romantic solace. Users slot their phones into a plastic headset and are then immersed on a date, during which they can choose options for activities. It's not the first time mainland viewers have traveled to Hong Kong to evade censorship by Chinese authorities. Users can choose between four female models and spend a vacation with them in either Japan or Thailand, joining them on trips to cafes, hot springs and karaoke. The city's annual Ani-Com and Games fair sees thousands queue to try out the latest consoles or buy up comic book collectibles, often dressed up as their favourite characters. People have always thought that you need 3-D technology for this kind of content. However, Shiu's movie is still a pioneering attempt at using new 3-D technology in theatrical releases of erotic films, given that the market in the West is now largely dominated by DVD releases. They slot their phones into a plastic headset and are then immersed on a date, during which they can choose options for activities. Shiu is also targeting a May release for Singapore, although the filmmakers are still working with local censors on the final cut. Many mainlanders crossed over to watch the uncut version of Oscar-winning Taiwanese director Ang Lee's sexually explicit spy thriller "Lust, Caution. The movie's Hong Kong performance has also been boosted by an influx of mainland Chinese viewers, whom Shiu estimates accounted for up to half of the business at some theaters.