High school student Naotatsu travels to live at his uncle's house. In the pouring rain, he is picked up at the nearest station by a strange adult woman named Sakaki who guides him to an unexpected share house where a life together begins.
Unfortunately the movie The Water Flows to the Sea is not yet available on HBO Max.
| Production | Ayumi Kondo | Producer |
| Production | Keisuke Konishi | Executive Producer |
| Production | Yohei Takami | Executive Producer |
| Directing | Tetsu Maeda | Director |
| Writing | Satomi Oshima | Screenplay |
| Writing | Retto Tajima | Original Story |