Deemo is a lonely individual who lives in solitude, playing the piano in a castle. One day, a girl who has lost her memory falls from the sky. Wanting to help her recover her memories and return to her world, Deemo discovers that a tree kept atop the piano will grow whenever the piano is played.
Unfortunately the movie DEEMO Memorial Keys is not yet available on HBO Max.
| Crew | Kouichirou Tamura | Technical Supervisor |
| Editing | Yoshinori Murakami | Editor |
| Visual Effects | mebachi | Character Designer |
| Directing | Shuhei Matsushita | Director |
| Directing | Yoshihiro Hiramine | Assistant Director |
| Production | Junichi Fujisaku | Production Director |
| Art | Hiromasa Ogura | Art Direction |
| Visual Effects | Shunsuke Imaizumi | Modelling Supervisor |
| Sound | Jin Aketagawa | Sound Director |
| Writing | Bun-O Fujisawa | Screenplay |
| Writing | Junichi Fujisaku | Screenplay |
| Sound | Yuki Kajiura | Original Music Composer |
| Sound | Hinano Takashima | Theme Song Performance |
| Visual Effects | Yumiko Katayama | Color Designer |
| Art | Yoshitsugi Yoshida | Storyboard Artist |
| Editing | Akira Saitoh | Color Grading |
| Camera | Hisashi Ezura | Director of Photography |
| Art | Hiroumi Yoshida | Art Designer |
| Sound | Yasunori Mori | Music Producer |
