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|Japanese name:|| 赤井 務武 |
|Relatives:|| Mary Sera (wife)|
Shuichi Akai (first son)
Shukichi Haneda (second son)
Masumi Sera (daughter)
|First appearance:|| Manga: File 974|
|Appearances:|| Chapters: 1|
|Keyhole number:||Volume 92|
17 years prior to the current timeline, Tsutomu Akai was involved in the double murders of Kohji Haneda and Amanda Hughes. What happened to him during and after the incident is currently unknown. Tsutomu was believed to be deceased by his family, however, his body was never found. It was his involvement with the murder case that prompted his son Shuichi to join the FBI in order to investigate what happened to him, and his assumed death led Shuichi to seek vengeance against those responsible.
Before he went missing, Tsutomu sent his wife a message telling her that he had made enemies with "horrible people," asking her to take their children to Japan, and to think of him as someone who no longer existed. Sometime after his daughter Masumi was born, so both Masumi and her father never got to know each other.
Tsutomu Akai looks quite similar to his second son, Shukichi, having roughly the same hairstyle and facial design; unlike his son, Tsutomu did not appear to shave his facial hair regularly. In Mary's memory, he wore a large jacket, a loose white tie, and a cap which, along with his hair, concealed part of his face.
 Plot overview
Masumi tells Conan that several things, including the apparent death of her father, led to she and her brothers each having three different surnames.
Tsutomu had his name printed on Shukichi's marriage certificate. However, the pronunciation of his name was not revealed.
While Mary and Shuichi believe him dead, Tsutomu's body was never found.
When Shuichi speaks of being "infected by the disease called curiosity," Mary is immediately reminded of Tsutomu. Shukichi is also reminded of Tsutomu when Mary tells Shuichi to "purge the fog that covers the truth."
So far, the amount of information on the patriarch of the Akai family is very vague. 17 years ago, he was involved in some way with the murders of Kohji Haneda and Amanda Hughes. During which, or shortly after, he became an enemy of "horrible people," prompting him to message his family that they should move to the safety of Japan. From this point on, the father is thought of as dead, however a body was never discovered.
 Fan Speculation
Some fan theories have been floating around about how, specifically, he was connected to the Kohji case, as well as whether he's truly dead or not. Such theories include that Tsutomu was truly dead. His missing body implies that he was captured and terminated by the Black Organization after his involvement with the case. Another popular theory is that Tsutomu is alive and has now changed into Hyoue Kuroda because Kuroda is remarked by Yui Uehara to have changed his appearance completely after a 1-decade coma. Another theory is that Tsutomu is in fact the bodyguard Asaka who has gone missing for 17 years because both Tsutomu and Asaka are both missing in the current timeline and were involved with the Kouji case 17 years ago.
 Relationships analysis
 Shuichi Akai
Tsutomu's death drove Shuichi to seek revenge.
 Shukichi Haneda
 Masumi Sera
Masumi was born after the family moved to Japan, so she never met her father. But a good friend of her father would provide for her. It is unknown if he was aware that Mary was pregnant with their third child before he died.
 Name origin
- His name was first revealed via Shukichi's marriage registration in Volume 89. However, at the time, the exact pronunciation of the name was unknown.
- The kanji in his name, 務武, can also be read as "Zumu". This is a possible reference to Zeon Zum Deikun (ジオン・ズム・ダイクン Jion Zumu Daikun), the father of Char Aznable.
- Technically, Tsutomu's first appearence in the anime was in the new opening theme song during September 2017.
 In other languages
 See also
|Rum arc topics|
|Main interest||Rum • Case from 17 years ago|
|Connections||Kohji Haneda • Asaka • Amanda Hughes • Tsutomu Akai|
|Related Articles||APTX 4869 • APTX 4869 Victim list • Rum arc timeline|
|Cases of interest||The Scarlet Return • Three First Discoverers • Haneda Kouji's death case • Soul Detective Murder Case • A song named ASACA • Burning Tent Murder Case|