The Testament of Sister New Devil

Basara Tōjō is a first-year high school student who suddenly gains two beautiful step-sisters when his eccentric father remarries, but then his dad and his new wife embark on an overseas trip. However, the two sisters Mio and Maria Naruse are actually a novice devil and succubus. Basara almost ends up forming a dangerous servant and master contract with them, but due to an error, the contract becomes reversed, and Basara becomes the master instead.

Volumes

9 in the canonical sequence

English packaging

9 books, 9 releases

Publishers

Seven Seas Entertainment

Also known as

Shinmai Maō no Testament, 新妹魔王の契約者, 新妹魔王の契約者（テスタメント）