"Kimi no Mana wa Rina Witch" plunges viewers into a magical academy where witches need more than spells to fight monstrous Eaters—they need a steady supply of mana from specially gifted men. Follow Toshiya, a low‑level student thrust into an elite training program, as he partners with idol‑witches Rina and Alyssa for steamy, explicit sessions that power up their magic and push their sinful bond to the limit. With a mix of fantasy action, tongue‑in‑cheek ecchi, and full‑on hentai, this OVA delivers a short, intense ride through a world where pleasure literally fuels the fight for survival.