Rikka transforms from daughter into weapon in real time, and the movie never wastes a frame showing you how that breaks something inside her. The animation doesn't just move, it snaps, every frame weighted like it costs her something. A ninja girl becoming a black-ops operative sounds familiar until you watch her actually do it, then the familiarity stops mattering.

Rikka Isurugi grows up in a hidden ninja residence tucked into a corner of a futuristic city, training in ninja arts under her grandfather Hyoe and admiring her father Allen, a respected researcher. Allen has built advanced AI drones that he means for civilian use, but others have darker plans for them. On Rikka's sixteenth birthday, a paramilitary group storms the family home looking for the technology, and her father and grandfather are killed. Rikka gets away with the drones. Months later she lives an ordinary life as a private detective, sharing an apartment with a girl named Melissa. At night she puts on her grandfather's fox mask and hunts the people behind the attack. The film is a sci-fi action story that pairs ninja tradition with futuristic technology.