Excellent novel-based sci-fi/psychological anime movie...must rewatch when other 2 movies comes out as part of Project Itoh.
Some information about the novel-based movie and authors:
"Shisha no Teikoku" as well as "Harmony" and the upcoming "Genocidal Organ" are all part of Project Itoh. The 3 novels are mostly authored by Itou Satoshi- 伊藤計劃 (AKA: Project Itoh, Itou Keikaku) includes: "Gyakusatsu Kikan-Genocidal Organ" (2002), "Harmony" (2008), and "The Empire of Corpses" (2012).
"Since 2001, he had to be hospitalized frequently for recurrent cancer and died at age 34 on March 20, 2009. During that time he finished his first 2 novels, while it's said that he just completed Harmony before being unable to continue writing." Shisha no Teikoku was the last story Itou Satoshi wrote and he was only able to complete the first draft of the story, which was later completed after his death by co-author Toh Enjoe-円城塔.
(Sources: ANN, Baka-updates, and Wikipedia)