Chisako Satoya, a writer, and her father, Kozo, had a long-standing feud and had been living apart for a long time. However now that Kozo, who lives alone, has dementia, she returns to her hometown to begin taking care of him.
Unfortunately the movie Stay Mum is not yet available on HBO Max.
| Directing | Kosai Sekine | Director |
| Writing | Koji Kitakuni | Book |
| Production | Shingo Ishikawa | Producer |
| Art | 野村哲也 | Decorator |
| Production | Yasuhiko Hattori | Producer |
| Sound | Moeka Shiotsuka | Theme Song Performance |
| Sound | Yurika Kasai | Theme Song Performance |
| Sound | Hiroa Fukuda | Theme Song Performance |
| Writing | Kosai Sekine | Screenplay |
| Writing | Koji Kitakuni | Original Story |
| Production | Yuhiro Matsuoka | Executive Producer |
| Costume & Make-Up | Ayano Tachibana | Costumer |
| Camera | Senzo Ueno | Director of Photography |
| Editing | Yoshitaka Honda | Editor |
| Costume & Make-Up | 那須野詞 | Makeup & Hair |
| Art | Yui Miyamori | Art Direction |
| Production | Mayo AOKI | Associate Producer |
| Sound | Keisuke Shibuya | Sound Effects |
| Sound | Aska Matsumiya | Original Music Composer |
| Lighting | Masachio Nishida | Gaffer |
| Production | Sakurada Junpei | Producer |
| Production | Keisuke Konishi | Executive Producer |
