The first chapter of the Refrain Blue series, tells about the recollection of Yoshihiro's past about various events of summer school, of the fate where encounter and separation are interwoven with each other, as Yoshiro and Matsunaga will pass the Toyo Gakuen and will arrive at summer school at seashore. A mysterious girl smiles as she watches Yoshiro who stands still at the seashore dusk.
Unfortunately the movie Refrain Blue: Chapter 1 - Scarlet Remembrance is not yet available on HBO Max.
| Writing | Takawo Yoshioka | Screenplay |
| Visual Effects | Mayumi Watanabe | Animation Director |
| Directing | Norio Kajima | Director |
| Visual Effects | Mayumi Watanabe | Character Designer |
| Sound | Kouichi Iizuka | Sound Director |
| Sound | Hikari Okamoto | Theme Song Performance |
| Camera | Takashi Azuhata | Director of Photography |
| Production | Saburou Oomiya | Producer |
