Half a year has passed since the official approval of TOKYO MER. Kitami is racking his brains over the issue of a second doctor to replace Otowa, who has left the team in order to expand MER to ordinance-designated cities nationwide. Some members of the team want Hina to be promoted, but Otowa asserts that Hina should pursue her path of cardiovascular surgery. She felt the pressure that Hina could take Otowa's place, and she was troubled.
Unfortunately the movie Tokyo MER: The Sumida River Mission is not yet available on HBO Max.
| Directing | Aya Matsuki | Director |
| Writing | Tsutomu Kuroiwa | Screenplay |
