Eri, a girl who likes to stay indoors, meets a mysterious but enthusiastic transfer student named Haru. Eri used to love to sing and Haru loves Eri's singing. The story follows the two during one summer of their high school life as their love sometimes overlaps and sometimes passes by each other.
Unfortunately the movie Music Girl is not yet available on HBO Max.
| Production | Norimitsu Urasaki | Producer |
| Directing | Ken'ichi Ishikura | Director |
| Writing | Kana Yamada | Writer |
| Visual Effects | Maziro | Animation Director |
| Crew | Hitoshi Yonezawa | Cinematography |
| Art | Satoru Hirayanagi | Art Direction |
| Editing | Masahiro Matsumura | Editor |
| Visual Effects | Imari Katsuragi | Color Designer |
| Sound | Yasushi Inomata | Sound Effects |
| Art | Koharu Sakura | Original Series Design |
| Visual Effects | Tometa Ohara | Character Designer |
| Art | Tometa Ohara | Original Series Design |
| Visual Effects | Koharu Sakura | Character Designer |
| Visual Effects | Maziro | Character Designer |
