Hamaji Ohyama (voiced by Minako Kotobuki), who has lived in the depths of the mountains since childhood, is only a 14-year-old girl, but she has excellent hunting skills under the training of her grandfather, and an exaggerated iron cannon is extremely powerful. After his grandfather passed away, he received a letter from his brother Michisuke (voiced by Katsuyuki Konishi). In order to become a samurai, Michisuke went to Edo alone in his early years, but he never succeeded. Hamaji packed his bags and went to Edo to find his brother. At the same time, the monster "Fu" with human and dog bloodline in Edo was rampant, and the general offered a reward for hunting it down. Michisuke saw the hope of becoming famous, so he hoped to use his sister's power to hunt down the last two "Fu". An unprecedented experience, Hamaji will experience the most unforgettable memory... This film is adapted from the original work "Fushi Fake: Satomi Hakkenden" by Kazuki Sakuraba, and is a commemorative work for the 90th anniversary of the founding of "Bungei Shunju".