OK, so let's put together the Byuu story as best we can.
Jun 24, 2021: Byuu shows up at work for the last time. (But he was mostly remote anyway)
Jun 27, 13:00: Arakawa Police's estimate of Byuu's time of death. (This is probably just "About 24 hours before we found him")
Jun 27, 15:30: An unknown person calls the embassy to warn about an impending suicide, based on Byuu's suicidal Twitter posting.
Jun 27, 16:37: An American living in Osaka emails the embassy. (Marcan lives in Tokyo now - was that true at the time too?) Claims a Frenchman in Tokyo had also contacted the local police.
Jun 27, 17:00: Someone (presumably Marcan) calls and tells the "I listened to him die" story. Claims that he talked to Byuu for about an hour that day starting at 11:11, and then listened to his French music for another hour.
Jun 27, 19:10: Someone using a Netherlands phone number calls with more personal info about Byuu. Claims to have called the local police.
Jun 27, 19:45: Embassy emails Byuu to check on him.
Jun 27, late afternoon and night: Arakawa Police try twice to visit or peek into Byuu's apartment but were unable. They suspect the power might be cut off for nonpayment.
Jun 27, night: Consulate tries multiple times to call Byuu at several phone numbers. An unspecified woman also tries emailing him and calling the police - the police tell her they had already been there unsuccessfully.
Jun 28, 08:53: Consulate calls Arakawa Police. Police say that they are aware of the case and will contact the property managers to unlock the room.
Jun 28, 10:34 to 11:09: Someone calls and emails the consulate claiming to know Byuu's US address. The consulate tries to call back but doesn't get a response. They end up just emailing him asking for any further info.
Jun 28, 13:15: Arakawa Police enter Byuu's apartment and find him hanging in the kitchen/living room, dead. They move the body to the police station; take his keys, cards, and phone; and lock the apartment.
Jun 28, 15:20: Consulate tries to call Byuu and the husband again. Another consulate staffer learns the police are onsite.
Jun 28, 15:59: Consulate on the phone with police, learn that Byuu is dead.
Jun 29: Embassy sends letter of condolence to Byuu's husband via email
Jun 29, 04:41: Husband replies and starts correspondence with embassy.
Jun 29: 09:26: Embassy completes a phone call with the husband
Jun 29, during the day: Embassy informs Arakawa Police that they are in touch with the husband. Embassy calls "the employer/POC at work" who is willing to help. Unable to contact landlord.
Jun 29, 12:02: Consulate gets in touch with someone at Cyber Gadget (probably Hiromi Imai - see below) who is reluctantly willing to be the local point of contact. He worked with Byuu for 2+ years and helped him get a Japanese visa, but didn't see him very often because Byuu mostly worked remote.
Jun 30, 09:04: Arakawa Police inform embassy that they are examining the body with the Tokyo Medical Examiner's office, want to know if the husband wants an autopsy.
Jun 30, during the day: Consulate informs police to go ahead with autopsy. Consulate gets in touch with the landlord, deals with bureaucracy about winding up the lease, bank accounts, etc.
Jul 1, afternoon: Autopsy completed at Tokyo University Hospital; body returned to Arakawa Police Station.
Jul 1: Hiromi was asked to take responsibility for scattering the ashes (once the body was cremated) somewhere Byuu liked, but replied that as Byuu was a shut-in, he didn't know any such place.
Jul 2: After more correspondence, the husband sends over his "letter of instruction" for the remains. He claims to have found a funeral home that will cremate Byuu and scatter the ashes in Tokyo Bay. It is never confirmed if this actually took place or what the ashes' ultimate fate was.
Jul 14: Arakawa Ward issues an official Japanese death certificate.
Jul 15: Cremation scheduled to take place. Presumably does take place but nothing further is mentioned about it.
Jul 16: Embassy requests postmortem report from Japanese medical examiners.
Jul 23, 13:45: Byuu's mother-in-law (the husband's mother) calls the consulate asking for confirmation about the suicide. She had apparently talked to her son but didn't get a clear answer because he was "going through a lot". Consulate will call her back.
Jul 27: Consulate tries a few times to call the mother-in-law but doesn't get a hold of her.
Aug 2: Japanese medical examiners complete their postmortem report, and send it out the following day.
Aug 3: Embassy sends someone (presumably the husband) a "preliminary death report" and a copy of the Japanese report. They say the cause of death is unknown pending autopsy, but that doesn't match up with what's on the Japanese form. I assume this is just sloppiness or the person preparing the message not being able to read Japanese.
Aug 13: Consulate receives autopsy from Japanese police.
Dec 20, 2022: "Simohamed Benbattouche" submits a FOIA request that the government for once doesn't ignore
Oct 16, 2023: Government sends documents back in response to the FOIA.