Coming from the anime official website, a new OVA is in the works for The Testament of Sister New Devil, titled “DEPARTURES.” The hour long movie will be screened in three theaters for two weeks beginning on January 27, 2018. The select theaters are Kadokawa Cinema Shinjuku in Tokyo, Fushimi Miliionza in Nagoya, and Umeda Burg 7 in Osaka. Afterward, the Blu-Ray/DVD of the movie will be released in March 2018 and will include newly-written novel by the novel author Uesu and a newly-recorded “Ecsta CD” by the six main cast: Ayaka Asai, Sarah Emi Bridcutt, Kaori Fukuhara, Iori Nomizu, Seiko Yoshida, and Yuu Asakawa.
Tetsuto Uesu’s action romantic-comedy light novel was adapted into a two-season anime, “The Testament of Sister New Devil”, which ran for 12 episodes between January and March and “The Testament of Sister New Devil BURST”, which ran for 10 episodes from October to November. Both seasons aired in 2015.
— 新妹魔王の契約者 (@shinmaimaou) October 26, 2017
Also, a Blu-ray box set called “The Testament of Sister New Devil Ecstasy” will be released February 23, 2018 and will include all 22 episodes of the anime along with two OAD episodes.
Announcement trailer for The Testament of Sister New Devil Ecstasy box set!