Twin Angels (2)

Sisters Ai and Mai Amatsu may look ordinary, but they're the last line of defense between humanity and an army of resurgent Demon Beasts. Descendants of a celestial maiden who chose to stay on Earth, they've inherited a sacred duty — and a magical transformation — passed down through their bloodline and guided by their grandmother, Amatsu Genshu. When the Demon Beasts begin making moves to recruit powerful figures and wipe out the celestial watchers protecting humanity, the sisters have to step up fast. This 4-episode OVA from Arms leans into a mythology-heavy setup — ancient demons, heavenly lineages, spiritual armor — and wraps it around two protagonists who actually have a believable dynamic as siblings figuring out a responsibility they didn't ask for. The action sequences have real energy, and the transformation scenes are a clear centerpiece of the production. Fair warning: this sits firmly in hentai territory, so the mature content is woven throughout rather than incidental. If you've watched things like La Blue Girl or Demon Beast Invasion and you're already comfortable with that genre, the supernatural worldbuilding here gives it a bit more narrative grounding than you might expect. It's not trying to be subtle about what it is, but the celestial-versus-demon framework gives the story something to hang on beyond the obvious. A short watch, and it delivers exactly what it sets out to do.