According to Famitsu.com, light novel "Maoyuu Maou Yuusha
" was announced to get a TV anime adaptation. Maoyuu was originally created as an impromptu play-style novel and posted on 2channel BBS in 2009. Several manga adaptations
have been published.
Maoyuu novel official website on Enterbrain
Maoyuu manga official website on Famitsu.com
Maoyuu anime official website
Maoyuu Maou Yuusha