Hagakure Makoto, young and cute, is trying to find a regular job to help support her family. She has no training in the real world, and she will meet with several corporate evils. But she was trained as a samurai by her grandfather, which will be useful to battle the evils of the world, including a bad samurai girl who is protected by an impenetrable net armor - with a week spot, like Achilles' heel. Eventually, it will come the time Makoto must leave this world - passing her skills into another young and cute girl.
Unfortunately the movie Samurai Girl 21 is not yet available on HBO Max.
| Directing | Ataru Oikawa | Director |
| Writing | Takashi Taketsuka | Writer |
| Writing | Tatsuo Kanai | Comic Book |
| Writing | Mutsumi Sakurakouji | Comic Book |