Kaoruko and Kazumasa Harima are a separated couple with two children. They plan to divorce once their daughter, Mizuho, enters elementary school. One day, they receive devastating news of their daughter falling into a coma after a near-drowning accident at a pool. The doctors declare her brain dead with no prospect of recovery and the couple must decide if they should donate her organs to others in need or to wait until her heart stops beating.
Unfortunately the movie The House Where the Mermaid Sleeps is not yet available on HBO Max.
| Sound | Ayaka | Theme Song Performance |
| Writing | Keigo Higashino | Novel |
| Directing | Yukihiko Tsutsumi | Director |
| Writing | Eriko Shinozaki | Screenplay |
| Editing | Chieko Suzaki | Editor |
| Lighting | Kôta Satô | Lighting Technician |
| Art | Toshihiro Isomi | Art Direction |
| Sound | Alexis Ffrench | Original Music Composer |
| Camera | Daisuke Soma | Director of Photography |
