Since it emerged in Japan nearly a decade ago, the cell phone novel, or keitai shosetsu, has moved from a little-known subgenre to a mainstream literary phenomenon.

CNN: Cell phone stories writing new chapter in print publishing

The 22-year-old who would rather be identified by his pen name than his real one (Yume-Hotaru means "Dreaming Firefly" in Japanese) started composing the novel on his cell phone in 2007.

CNN: Cell phone stories writing new chapter in print publishing