Mahiru "Shin'ya" Bamba
Mahiru Bamba
Kanji 番場 真昼

(番場 真夜)

Rōmaji Banba Mahiru

(Banba Shin'ya)

Occupation Student (former)

Assassin (former) Maid

Attendance No. 12
Gender Female
Age 15
Status Alive
Debut Appearance
Anime Episode 1
Manga Chapter 1
Voice Actor
Voice Actor (jp) Yuka Ootsubo
Image Gallery

Mahiru Banba (番場 真昼; Banba Mahiru) is one of the main characters of the manga and anime series Akuma no Riddle. She is a rather shy and mysterious appearing young woman who's a former assassin who's developed a second personality at some point in her past named Shin'ya Banba (番場 真夜; Banba Shin'ya) who's a quite more rude and violent personality than the actual Mahiru. Both are like two souls who share the same body thus both never appear at the same moment throughout the plot, yet both are able to communicate with each other to a certain degree. She is also a former student of the 10th year's Black Class at Myojo Academy who was in a competition with the other students of that class who were trying to kill Haru Ichinose where the reward is anything what that assassin may want. However, she didn't want/need anything as a reward, because Mahiru wanted to turn Haru's phone strap into a "relic", which required killing her.

In the final chapter of the manga, it's shown that Sumireko Hanabusa is back in her mansion in good condition after the Black Class disbanded and employed Mahiru Banba as her maid.

In the final episode of the anime, while appreciating the view from a hilltop, Mahiru tells Shin'ya that she won't be needing her for a while.

Assassination Attempt

Shin'ya was the eighth person to attempt an attack on Haru after sending out a warning letter.

She started to attack Haru when Isuke Inukai and Tokaku Azuma were having a raging duel with each other. She showed her warning letter as she broke the door down of the room in which Haru was hiding with her (Shin'ya) huge sledgehammer. Shinya then tries to hit Haru with the sledgehammer several times but they were all in vain. Shinya then raised her sledgehammer to strike again but Haru threw her cell phone at her forehead and when Shinya dropped the hammer, Haru made a run for it out of the classroom and then ran down the hallway into the cooking training room where she hid herself.

However, that didn't deter Shin'ya from finding her immediately and striking several more time with her sledgehammer and then cornering Haru for a brief moment until Haru sprayed the fire extinguisher into her face and then making another run for it out of the classroom again but this time she hid herself in the supply room of the girl's washroom. This time her hiding spot worked and Shin'ya passed that certain room straight. However, a broom inside the room fell and Shin'ya heard the sound and decided to come back and destroy each door of each room and when she finally reached the supply's room door, Haru pushes open the door with full force hitting Shin'ya in her face. Shin'ya then falls to the ground and Haru makes a run for it again. Shin'ya then decides to take a 10 minute break.

Despite taking a break, Shin'ya still catches up with Haru and continues to strike and miss Haru more times with her hammer. Haru then runs into the audio visual room this time and was cornered by Shin'ya again. Then, the projector at the top of the room then comes on and it's bright light similar to a camera's flash shone directly into Shinya's eyes reminding her of her terrible past. Isuke then picks Shin'ya up by the head and hits her a kick sending her flying, without being heard from for the rest of the night.

She and Isuke both become the seventh person to be expelled from the Black Class.


She suffers from what is supposed to be dissoactive personality disorder, where she has two different personalities. As Mahiru, she is a shy and timid girl who often has trouble speaking for herself. She is easily subject to bullying, and is often defenseless. However, when the sun sets, Mahiru's alternate personality, Shinya Banba, appears. Shin'ya is the complete opposite of Mahiru, and refers to herself (or even himself) as "ore (俺)", which is a rather rough masculine way when referring to oneself. In contrast to her host personality, Shinya has an aggressive and borderline insane appearance.


She has long white hair tied in a ponytail. She wears a school uniform which is a white shirt with a red collar and red cuffs; it also has a black necktie and black skirt. She wears a black stocking on one leg and a white sock on the other. She has a scar over her left eye from when she killed her captor.

Skills and Abilities

Shin'ya is able to enter a temporary state that grants her superhuman strength, though she is unable to use it for extended amounts to time without rest. She also seemed to be excellent at tracking her targets as seen when she was playing cat and mouse with Haru. 


Only vague hints have been given regarding her past, where she was somehow imprisoned in a room. After being abused and tortured for an unknown reason, there was always a large amount of unwanted flash photography, which traumatized her. Eventually, Mahiru was driven to kill her captor which led to the event of her obtaining her scar and the split personality of Shin'ya


  • Mahiru's and Shin'ya's names have polar opposite in meanings, with Mahiru's (真昼) being "midday" and Shinya's (真夜) being "full night". Mahiru / Shin'ya wears black and white socks, possibly to represent this split personality.
  • The flowers left on her desk were moonflowers and Japanese bindweeds, which mean "bewitching" and "ties". Their Japanese names: "Yorugao" and "Hirugao", literally mean "night face" and "day face" which refers to how Mahiru is the face seen during the day and Shin'ya being the face seen at night.
  • Her birthday is September 28th.
  • In chapter 16, Mahiru mentions that Shin'ya is somewhat concerned about their weight.
  • According to Shin'ya, Mahiru always wanted to swim in a school swimsuit.
  • She was the first and only assassin who wanted to kill Haru without having any desire of reaching a certain goal or gaining any certain reward in mind.

Ad blocker interference detected!

Wikia is a free-to-use site that makes money from advertising. We have a modified experience for viewers using ad blockers

Wikia is not accessible if you’ve made further modifications. Remove the custom ad blocker rule(s) and the page will load as expected.