This was posted on August 9th, 2020
The person in the recording is most likely Hashiraba Haruo. I think he died here, that’s why Shidou is crying
Wouldn’t it make more sense for the recorder to be Sakurai, not Haruo? August 9th is Sakurai’s story, and that woman on the last page seems to be Miyako and is the “her who once said she loved me” that the person recording is talking about. Plus it seems like Shidou plays the recording for Miyako in her cell and it calms her down (the scratch marks on walls indicate that Miyako is not a docile prisoner).
Either way though, I did not expect this spin off to give what is essentially an epilogue for Hachigatsu. Seems Sakurai does indeed die, and Miyako survives but is sealed away by Shidou and Haruo’s organization? Depressing, but I’m glad that recording appears to give Miyako some level of peace.