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AP–21110★ 6.5
// About this anime
Searching for Shinmai Maou no Testament: BURST? That title and The Testament of Sister New Devil BURST point to the same show. It's a TV series across 10 episodes out of Production IMS. It's finished airing, so the whole thing is watchable start to finish.
Genre-wise it's tagged Action, Ecchi, and Fantasy, which is the throughline if you're browsing by mood rather than by name. If The Testament of Sister New Devil BURST works for you, Attack on Titan and Demon Slayer: Kimetsu no Yaiba are close matches — see the full related list below.