Lillia and Treize (リリアとトレイズ, Riria to Toreizu) is a Japanese light novel adventure series written by Keiichi Sigsawa, with illustrations by Kohaku Kuroboshi, starring the children of the characters from Allison. There are six light novels in the series, published by MediaWorks under their Dengeki Bunko label. The first novel was released on March 10, 2005, and the last novel was published on April 10, 2007; there are three stories in the six volumes, with each story taking up two volumes. The series was followed by Meg and Seron. A manga adaptation by Hiroki Haruse was serialized in the shōjo manga magazine Comic Sylph, also published by MediaWorks, between December 9, 2006 and November 22, 2008 and compiled in two volumes. An anime adaptation aired between April and October 2008 based on