Madman Entertainment has the rights to this series in Australia; no North American pickup has been made at this point.
We learned back in April that Peppermint Anime has picked up the rights to release Testament of Sister New Devil in Germany this year and now they’re following through on it a bit more.
The light novel series began in 2012 and has nine volumes out so far in Japan.
The manga is adapted from the light novels of the same name that come from writer Tetsuo Uesu.