With about 80 million people in Japan are using their mobiles from texting to surfing the Internet and making video calls, there are plenty rooms to expand. Another string that has been released recently in Japan is mobile manga that is a service that allow mobile phone's owner to read manga (Japanese comic) in their mobile phones.
For starter, there are a number of sites that offer subscription fee of $10 to $15 a month. You can download every genre, as many as you like. Bandai Networks is one of the largest publishing outfits with 20,000 users subscribing to a catalogue of 400+ titles.
According to Mahota Asunuma of Bandai Networks, mobile users are becoming used to doing more and more with their phones, so the transition will be smooth. Also, the improvement of mobile screen that uses liquid crystal display will make people get less tired than they used to reading books on a phone. This new technology will significantly help to improve the market penetration.
Source: BBC News