Senagaki Isaku will be a first-year high school student starting in spring. Her grandfather is the third head of the Senagaki group, a yakuza organization, so she is feared by those around her. However, starting from spring, she hopes to make normal friends and normally fall in love. She is admitted into a high school further from her hometown, however, the overprotective young head of the Senagaki group, Utou Keiya, (26 years old) falsifies his age and enters the school with her through a backdoor admission…?! Keiya proclaims that love is too early for her although Isaku is perfectly ready. In truth, she has held an unrequited love for Keiya for quite some time.
Unfortunately the movie A Girl & Her Guard Dog is not yet available on HBO Max.
| Production | Yurika Koike | Producer |
| Directing | Keiichi Kobayashi | Director |
| Writing | Yosuke Masaike | Screenplay |
| Sound | Hokuto Matsumura | Theme Song Performance |
| Sound | Taiga Kyomoto | Theme Song Performance |
| Sound | Yugo Kochi | Theme Song Performance |
| Sound | Jesse | Theme Song Performance |
| Sound | Shintaro Morimoto | Theme Song Performance |
| Sound | Juri Tanaka | Theme Song Performance |
| Writing | Hatsuharu | Original Story |
| Writing | Hatsuharu | Comic Book |
