Double Under Dusk is a cell phone comic written by Hiroyuki Owaku and illustrated by Masahiro Ito. It came out in Japan in 2007. There does not seem to be any plans for a paper release, though some fans have asked Ito about it.
The plot centers around a man named Brian Dawson, who is mourning the death of his son, Ronny. He meets a young woman named Lindsay and they travel together to Silent Hill.