Isuke Inukai
Kanji 犬飼 伊介
Rōmaji Inukai Isuke
Occupation Student (Former)

Assassin (Former)

Attendance No. 2
Gender Female
Age 19
Status Alive
Debut Appearance
Anime Episode 1
Manga Chapter 1
Voice Actor
Voice Actor (jp) Azumi Asakura
Image Gallery

Isuke Inukai (犬飼 伊介; Inukai Isuke) is one of the main characters of the manga and anime series Akuma no Riddle. She is a former student of the 10th year's Black Class of Myōjō Academy who was in a competition with the other students of that class who all were set to try successfully killing Haru Ichinose where the reward was anything the assassin wishes for. The reward she requested for was enough money for herself and her parents which would be used to build a house for her parents either in the Caribbean or the Alps. 

In the final episode, she is vacationing with her parents in the Caribbean, but is a little sour about not owning the beach they're on.

Assassination Attempt

She was the very first assassin in the school that tried to kill Haru but that was before the rules of the Black Class were established. Her method was putting drugs in Haru's tea to make her unconscious and drowning her. However, after being interrupted by Tokaku, she leaves.

Later on in the series, she was the seventh person to attempt an attack on Haru after sending out a warning letter. With only 3 other assassins remaining, Haru receives a warning letter with Mahiru's name on it. When Haru and Tokaku reached the front of the dorm building, Isuke was there and suddenly tries to attack Haru with a knife, but Tokaku successfully defended Haru from the attack. They then realized that it was Isuke who sent the warning letter instead of Mahiru. Tokaku fought briefly for a moment with Isuke, but got injured by Isuke's attacks afterwards. Tokaku threw mud at Isuke in order to blind her, then ran away with Haru, bringing Haru to an empty class and locking her in.

Tokaku thought that Haru would be safe away from Isuke and proceeds to jump through the window. She is then confronted by Isuke and fights her again, but they suddenly hear a loud noise coming from the room where Haru was. Isuke reveals that Shinya is punctual, and that they made a promise whereby Shinya would "play" with Haru while Isuke takes care of Tokaku. The two continue to fight when Tokaku's cellphone receives a sudden message from Kaiba. The distracted Tokaku then gets caught in a neck lock by Isuke, and then her cell drops onto the ground and Isuke proceeds to smash it. Tokaku struggles for a few seconds and drops her knife, but she was unable to set herself free. She then activates a hidden taser in her shoe, zapping Isuke on her back, stunning her for a brief moment. Tokaku then proceeds to pick up her weapon to finish off Isuke when suddenly she stops and remembers a shrine. Isuke tries to take advantage of this moment, but wasn't recovered fully, and Tokaku landed a kick to her gut knocking her to the ground. She then runs off to look for Haru. However, not long after, Isuke shows up behind her and the two of them start to fight again. While Tokaku was dodging attacks, she was cornered and leans on a glass window allowing Isuke to push her off the building.

Isuke then heads to the audio visual room where she finds both Haru and Shinya, and she turns on the projector at the top of room which reminded Shinya of her terrible past. Isuke then picks Shinya up by the head and sent her flying with a kick. Isuke's attention then focuses of Haru and begins strangling her as they both thought that Tokaku is dead. However, just in the nick of time Tokaku shows up stopping Isuke by throwing a knife in her wrist. Isuke pulls the knife out of her wrist and tries to shoot Tokaku but the bullet only grazes her and she tries a second time but Tokaku dodges the bullet and hits the gun out of her hand. Tokaku then pins Isuke to the ground using her leg and pulls on Isuke's right arm eventually breaking it. Tokaku gets off of her and sits on top of her, still holding her arm. Tokaku uses her left arm to pin Isuke's head down and then grabs her neck and chokes her until she becomes incapacitated.

Both Isuke and Mahiru become the seventh person to be expelled from the Black Class.

After the Black Class officially disbanded Haru and Tokaku are seen receiving their diplomas and Haru even taking the diplomas of the 11 other former students of their class and went on a journey to give each (ex-) assassin their earned diploma. During that scene it's shown (in the manga) that Haruki, who's now working as a construction worker, received a call from from her lover. Co workers of her ask if that's her boyfriend.
Isuke & Haruki

The next panels switching over to a beach scenery where Eisuke can been seen together with his daughter Isuke who tells her that Haruki should hurry up to come back home or she'd get angry. Eisuke then jokingly remarked that he's wondering how caring his adopted daughter can be towards her lover to which Isukes simply replies with saying she just loves Haruki and can't help it.


She has a sadistic and a somewhat narcissistic personality. Isuke is rather blunt when she speaks, and she likes to express her opinions.
Isuke pistol

Isuke attempts to shoot Tokaku.

She also likes to command other people, such as making Haruki Sagae call her "Isuke-sama". Isuke is also easily annoyed by trivial things, and she doesn't care about school work or helping others.

What also seem to annoy her is when she's not able to knock a target of hers successfully at first attempt. In such a situation Isuke even is prone to use a pistol and shoot her target, spilling blood if needed.


Isuke's hair is long and wears pink colors with ringlets, her eyes are golden. Her usual attire seen throughout the plot (both manga and anime) consists of a small purple neck scarf, a long sleeved black jacket that shows her midrift, a purple plaid skirt and wearing a pair of heeled boots. She has purple nail polish on her nails.

Skills and Abilities

002 (1)

Isuke drawning her handgun.

Isuke's an excellent user of knuckle knives as shown in her fight with Azuma. She's also an excellent hand to hand combatant specializing in grabs and throws. Tho not really liking to use firearms she's been seen using a pistol during her encounter with Tokaku which she carried with her, hidden on the backside of her skirt to use it as last option in hope to finish off the other assassin quickly.


Sometime in the past, her parents neglected and nearly let her die, but Eisuke Inukai happened to be next door and intervened by killing them. However, he was a little too late to save her brother. He introduced himself and gave a name to her on the spot, claiming that she will be his new daughter. He then wanted her to help and succeed him as an assassin.


  • In the postscript of the first manga volume Yun Kouga states that Isuke has the largest breast size of all female characters in Akuma no Riddle.
  • She has a boy's name due to being named after her male mother, Eisuke Inukai.
  • According to her, both of her parents are gay men who aren't related to her by blood.
  • She is 175cm tall.
  • She stated that her preferred method of killing is with her own hands, and doesn't like making noise or seeing blood while committing a murder.
  • She was the 1st assassin who sent out a notice with another class mate's name.
  • After Isuke was expelled, there were red carnations on her desk, which mean "mother's love". Unlike the others, her flowers were depicted as buds.
  • Isuke Inukai's handgun is a Remington 1866 Derringer.
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