| Akasaka Mamoru|
|Birthday||August 3, 1957|
|Daybreak Weapon(s)|| |
|Portrayed By|| |
|Image Song||BUCHIKAMACE Tekkoudan|
In Himatsubushi-hen, Akasaka appears somewhat naive and inexperienced, due to his young age. Later, he proves to be quite cunning when he plays mahjong with Ōishi and his friends, thus earning their respect. But in Matsuribayashi-hen, from his the martial art training, he becomes a very skilled and experienced officer. In the original Sound Novels, Rika states that the chances of Akasaka s survival and leaving the village are low, because he usually gets killed by the kidnappers during the investigation in most worlds.
Akasaka is sent to Hinamizawa to join Ōishi's department, which is investigating of the kidnapping of the cabinet minister's grandson. This kidnapping is suspected to have been perpetrated by the anti-dam movement, the "Onigafuchi Guardians".
Upon his arrival in Hinamizawa, he befriends Furude Rika, who tells him through her True Personality about the future deaths of herself and his wife. In an untold world, he regrets not being able to save his wife and Rika, and learns "Traditional Style Karate" to clear his mind from all the pain and hopes to relive the time before Himatsubushi-hen to save them.
Through a fate's miracle in Matsuribayashi-hen, he inherits the "Traditional Style Karate" and uses it to single handedly defeat a Yamainu Squad and their leader, Okonogi. He decides to save Rika from her prophesied death, as both a friend and as payment for warning him of his wife's death before it could occur.
The manga and anime versions of Matsuribayashi-hen are different in that the manga greatly expands on the story. In the anime, Akasaka discovers the curious connection between Koizumi and the Irie Clinic. In the manga, Rika is able to visit an Akasaka who has coped with the loss of his wife and unborn daughter by immersing himself in his job and karate. The Akasaka in this time regrets not heeding Rika's warnings in the past which led to the death of his wife and Rika. While not fully explained in the manga, this meeting allows a connection to the Akasaka in Rika's current time-line who wakes up as if having a nightmare at work. He remembers Rika and discovers Koizumi's payments to the Irie Clinic. Either way, Akasaka comes to help Rika. Much later in the manga, during the festival, Rika meets Akasaka and his wife and daughter. She refers to Akasaka as "father" which causes his wife to accuse him of having a "love child" in a bit of comic relief.
In TIPS of Tsumihoroboshi-hen (The Demon's Script), Akasaka returns to Hinamizawa with his colleague Sawada in 2005. There they discuss details about the Great Hinamizawa Disaster and how it was connected to Takano Miyo's File No 34.
Akasaka also appears in Saikai (Higurashi no Naku Koro ni Kai Episode 1), which is based on The Demon's Script. He meets Ōishi and Sawada, and both discuss about the Great Hinamizawa Disaster and how it was connected to Takano Miyo's File No 34.
Physical AppearanceAkasaka is a tall, muscular young man with black hair and dark brown eyes (In the Matsuri version his eyes are light brown). In Himatsubushi-hen he is shown to be a slender man who looks younger than he actually is.
During his free days, Akasaka wears a cream-colored jacket over a dark purple T-shirt, grey jeans (blue in the Matsuri version) and grey shoes.
In Himatsubushi-hen, during his work at the police, Akasaka wears a blue suit over a white collared-shirt and a green tie. When he disguises himself as a civil he wears a cream-colored shirt over a dark purple T-shirt, grey pants and grey shoes. He also carries a camera to look more like a tourist.
- He is voiced by Daisuke Ono in the anime and by Takehito Koyasu in the drama CD.
- Daisuke Ono is also the voice actor of Ushiromiya Battler, the main character of the Umineko no Naku Koro ni series.
- Although not appearing in the live-action movie adaption of Onikakushi-hen, Ōishi tells Maebara Keiichi that he "lost a close friend in the investigation of the murders in Hinamizawa". Ōishi was likely referring to Akasaka, though he could be referring to his surrogate father figure.
- A homonym of his given name, まもる (Mamoru) is Japanese for 'protect'.