The Testament of Sister New Devil

The Testament of Sister New Devil is a twelve-episode action fantasy series that aired during the winter season of 2015. The show blends ecchi comedy with supernatural romance as it follows Basara Toujou, a high school student whose ordinary life is upended when two girls move in with him—only to reveal they are a succubus and a future Demon Lord. The twist: Basara himself descends from a legendary clan of demon hunters, putting him at odds with his new housemates despite a master-servant contract that complicates their relationship further.

The series plays its premise for both humor and action, exploring how these three characters form an unlikely bond while navigating conflicts that arise from their supernatural backgrounds. With its focus on the dynamic between the protagonist and the two female leads, the show appeals to fans of romantic fantasy who enjoy lighthearted ecchi elements alongside genuine character development. The complete season finished airing in early 2015, offering a self-contained story arc across all twelve episodes. The pacing allows for both comedic moments in their shared living situation and escalating supernatural conflicts that test their newfound partnership.