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The Testament of Sister New Devil

A carefree high‑schooler’s routine is upended when two striking girls move into his home, each hiding a supernatural identity—one a seductive succubus, the other a nascent Demon Lord. Unbeknownst to them, he carries the blood of a legendary demon‑slayer clan, thrusting him into a bizarre master‑servant pact that forces the trio to coexist under one roof.

The series blends high‑energy battles with playful, risqué humor, exploring the uneasy alliance between a reluctant hero and his otherworldly tenants. Their growing camaraderie fuels a chaotic mix of action, romance, and fantasy, offering a fresh twist on the classic monster‑girl trope while delivering plenty of cheeky fan‑service.