Shinmai Maou No Testament: Toujou Basara No Har... Today

You can typically find this bonus material on community-driven sites like Baka-Tsuki or through fan translations, as it is often included with special light novel releases rather than main volumes. Shinmai Maou no Keiyakusha - Baka-Tsuki

Shinmai Maou no Testament: Toujou Basara no Harumagedon is a special short story or "extra" chapter that focuses on Basara's intense romantic interactions with Mio, Yuki, and Maria in a humorous, chaotic domestic setting. This side story often highlights the chaotic, intimate consequences of their master-servant contract, featuring high-stakes, erotically charged scenarios. Shinmai Maou no Testament: Toujou Basara no Har...