While celebrating with her friends in her new cheaply rented apartment on the thirteenth floor of a building, the young Sayaka unexpectedly jumps off the balcony committing suicide. Her mother goes insane and her older sister, Mariko, decides to investigate the mysterious death of her sister.
Unfortunately the movie Apartment 1303 is not yet available on HBO Max.
| Writing | Ataru Oikawa | Writer |
| Writing | Kei Ôishi | Writer |
| Writing | Takamasa Sato | Writer |
| Directing | Ataru Oikawa | Director |
| Production | Michael Taverna | Executive Producer |
| Sound | Masako Miyoshi | Original Music Composer |
| Production | Cindy Nelson-Mullen | Executive Producer |
| Production | Chiaki Harada | Producer |
| Production | Takeichi Honda | Executive Producer |
| Sound | John Lissauer | Original Music Composer |
| Camera | Tokushô Kikumura | Director of Photography |
| Editing | Shuichi Kakesu | Editor |
| Production | Daniel Fridell | Co-Producer |
