Heita Mamemomi
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Heita Mamemomi
A reporter's weapon are their legs! Legs to fly them wherever, to catch scoops all over! ...This is the Mamemomism I live by.

Heita Mamemomi was a Japanese journalist working for Taikoku News. He was writing a story about the author Sōseki Natsume at the time of Jezail Brett's murder. When Haori Murasame was put on trial for said crime, Mamemomi was called as a witness.

Investigation of BrettEdit

While working at Taikoku News, Mamemomi began covering the murder of John Watson by Jezail Brett, both of whom were from the British Empire. He was outraged at the Japanese government's inability to punish Brett under its own laws due to the interference of the British Empire. Instead, she was due to be sent to trial at the British consul offices in Shanghai, China; although this was not scheduled to take place until nine months after her guilt had been uncovered. In the meantime, she was allowed to continue her research at Teito Yūmei University under supervision.

After much investigation and speculation, Mamemomi came to the conclusion that some sort of shady deal was going on between members of the British and Japanese governments. Determined to bring about justice via his reporting of the scandal, he dug deeper, and uncovered an assassination plot involving two exchange students, as well as ties between one of them and Yūjin Mikotoba.

Mamemomi's justiceEdit

Main article: The Adventure of the Blossoming Attorney

Interviewing a professorEdit

Yujin Natsume newspaper

Newspaper article about Sōseki Natsume and Yūjin Mikotoba.

After Sōseki Natsume's first book proved very popular, Mamemomi began following the writer about in order to write a story about him. During Natsume's visit to Teito Yūmei University, Mamemomi took the opportunity to interview the author and Professor Yūjin Mikotoba. After learning about a very potent poison being developed by Mikotoba's lab, the journalist decided to fill his empty fountain pen with some of the substance in order to sneak it out for a news story.

Interviewing BrettEdit

Brett and Mamemomi

Being insulted by Brett.

At that moment, Jezail Brett entered the lab and declared that she wished to "gaze upon the sea of Japan with everyone", as she was soon due to be sent to Shanghai. The Japanese government allowed this, as long as Detective Satoru Hosonaga supervised her. Although Mikotoba was able to decline due to having work to do, Natsume and Haori Murasame, one of the professor's students, joined Brett for the trip. Mamemomi saw this as his opportunity to interview Brett about Watson's murder, and so he also joined them. However, although he managed to confront her at a reed beach tent, she was very dismissive of him, referring to him as an "oriental monkey, playing at journalism" who was unable to distinguish between eavesdropping real journalism. Mamemomi was so angered by this that he slipped the poison he had in his pen into Brett's drink before leaving.

Mamemomi's picture

Mamemomi's photo of the "crime scene".

Shortly after he had left, Murasame burst into the tent to demand Brett give back the poison she had stolen, unaware that Mamemomi was the true culprit. Listening behind the tent, Mamemomi quickly learned from their conversation that the poison had very specific side effects that would make it obvious that it had been used and thereby possibly linking Brett's upcoming death back to him, since the poison was unavailable outside of the lab he had stolen it from. Realizing this, he pushed between the reeds the tent was made of and stabbed Brett with a knife, hoping that she would die before the poison took effect. When Murasame went over to try and help Brett, Mamemomi took a photo of the young woman attempting to remove the knife in order to pin Brett's murder on her, and anonymously sent it to the police. Murasame was immediately arrested for the murder, since she was the only one in the tent at the time.

Murasame's trialEdit

During Murasame's subsequent trial, Natsume was called as a witness. Mamemomi initially just stayed behind the writer during his testimony, taking pictures whenever Natsume struck a pose. However, once Murasame's attorney, "Ryūtarō Naruhodō", revealed that the photo sent to the police had the same crack in the corner that the photo used for the article about Natsume and Mikotoba had, Mamemomi was called as a witness himself.

Once forced onto the witness stand, "Naruhodō" was eventually able to prove that Mamemomi was the true killer of Brett, with the poison in his pen (which he had accidentally left at the crime scene) acting as the final proof; a special reagent was able to indicate that the pen had been used to house the poison. Defeated, Mamemomi broke down on the stand, violently swinging his camera around his head while railing against the Japanese government before being incapacitated by Murasame and "Naruhodō" using a so-called "Ryūtarō Toss" on him.

Accepting his guilt, Mamemomi lamented the events of the past nine months and began providing some details about the discoveries he had made regarding the government's handling of Jezail Brett, although the presiding judge stopped him before he could continue and Mamemomi was taken away by the court bailiff.

As he was being taken away, Mamemomi overheard a discussion between "Naruhodō" and Mikotoba regarding the latter faking an illness to cause the former to return to Japan from the United Kingdom. He broke free of the men detaining him and rushed over to them, saying he knew the truth about the link between the "exchange student" and Professor Mikotoba. However, before he could elaborate further, the judge of the trial, Seishirou Jigoku, incapacitated him with a self-titled "Jigoku Toss". The bailiffs then resumed taking with Mamemomi away.

Susato Mikotoba later visited Mamemomi at the detention center before embarking on her journey back to England. He told that her that the body of Kazuma Asōgi, an exchange student who was meant to go to England but had been apparently killed during the voyage, had never been recovered; it was supposed to be handed over the Japanese embassy in Hong Kong, but had somehow disappeared.




A very enthusiastic and energetic man, Mamemomi took his work as a journalist very seriously, and was always looking for his next big news scoop. He followed his own personal philosophy that he referred to as "Mamemomism", which consisted of various mantras that he would use with little provocation. He also had the habit of frequently referring to himself in the third-person.

He was very much against Japan being submissive to the British Empire, which influenced his journalism to a great extent and led to his murder of Brett. He was also very dismissive of the modern system being used for Murasame's trial.


  • His surname "Mamemomi" (豆籾) might come from "memoru", which is a Japanese-English fusion verb meaning "to write a memo". This is backed-up by Mamemomi using the term "Mememomi-Memo" to refer to his notebook.