Relations for Natsu no Kotou no Yami no Koe

 Yami no Koe Zero   2008-03-28 ja  Gore Screaming Show   2006-01-20 en/ja/zh  Yami no Koe   2001-06-08 ja Sequel  Yami no Koe II   2002-11-22 ja Sequel  Yami no Koe III ~Gobou S...   2003-12-19 ja Sequel  Yami no Koe Ibunroku   2005-07-29 ja Same series  Natsu no Kotou no Yami n...   2008-03-28 ja/zh Shares characters Same setting  Sayoko   2011-01-28 ja Shares characters