Makai Tenshi Djibril 3

After a rough stretch — including saving a girl named Rika — Naoto has finally found some calm, but that peace gets upended when a demon named Misty Mei shows up and snatches his sister. Classic problem. Now he's stuck, unable to fight back, until a mysterious android named Nagi literally appears in his bathroom one night and changes the equation entirely. This is a 2-episode OVA from 2009, based on a visual novel, sitting squarely in the supernatural hentai space where angels, demons, and humans are constantly colliding — and 'colliding' means that in every sense of the word. The world-building leans into that angels-vs-demons framework, with Rika serving as the fighter on the front lines while Naoto figures out how his connection to Nagi fits into everything. The tone is part action setup, part explicit content — if you've watched things like Bible Black or La Blue Girl and appreciated how those series built at least some narrative scaffolding around the adult material, Djibril 3 operates in that same space. It's not pretending to be something it isn't. If Discipline: The Record of a Crusade scratched an itch for you — supernatural stakes wrapped around hentai content with actual recurring characters — this has a similar energy. Two episodes, a contained rescue arc, and a cast that carries over from the earlier entries in the series. Going back to watch parts one and two first probably helps with the character investment.