The shock of her fiance's sudden dissolution of their relationship causes university student, Miki, to lose her voice. While recuperating in a hospital in her hometown of Hakodate, she learns of the tragic life of her deceased mother, Kaoru, from her grandmother.
Unfortunately the movie Umineko - Inseparable is not yet available on HBO Max.
| Production | Toshiya Nomura | Producer |
| Production | Yoshihiro Kojima | Producer |
| Production | Kazuko Misawa | Producer |
| Production | Junichi Kimura | Producer |
| Production | Toru Ishii | Producer |
| Sound | Michiru Oshima | Original Music Composer |
| Sound | Genichi Tsushima | Music Producer |
| Sound | Shin'ichi Itô | Sound Effects |
| Sound | Fumio Hashimoto | Sound Recordist |
| Editing | Shinji Tanaka | Editor |
| Costume & Make-Up | Masae Miyamoto | Costume Design |
| Directing | Taiichi Sugiyama | Assistant Director |
| Directing | Yoshimitsu Morita | Director |
| Writing | Tomomi Tsutsui | Screenplay |
| Writing | Shiho Tanimura | Novel |
