mobilephone's novel

The mobilephone can connect to the internet, now. In Japan, the novel which we can read on the internet is popular. 『KOIZORA』 which is the novel in the internet in mobilephone. And then , that book is selling over 1,000,000 books! Why many people read mobilephone's novel? I think it is easy to read and mobilephone is very close to our life. Furthermore, that novel's story is tend to sympathy for us. It is good for us who don't have mush time to read the book.