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Muir Alenstarl

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Muir Alenstarl

Muir Alenstarl

Character Profile
Name (Kanji) ミュア・アレンスタール
Name (Romaji) Muir Alenstarl
Personal Information
Epithet Monster
Age 14
Gender Female
Race Human
Occupation Assassin
First Appearance
Novel Volume 04, Chapter 05

Muir Alenstarl was taken in by the Instructional School and trained as an assassin. She was the second strongest in terms of power, with Kazehaya Kamito being first. She has a Cursed Armament Seal on her arm that lets her control her ability, «Jester's Vice» which pulls out a spirit's powers to the limit.


Muir has a child-like personality and she does things as she please. She would not show any mercy towards anyone who defies her will. She obsesses over Kamito, calling him "Onii-sama" because he approached the lonely Muir and told her that he'll be her brother in the past. She adores Kamito as her elder brother with blind devotion. She also appears to really hate being ordered by others, with the sole exception of Kamito.


Muir Alenstarl had been taken to the «Instructional School» when she was only four years old. She was born in a cold village on the borderline of the Empire. She was not of noble blood and yet possessed the ability to contract spirits. Because of that, the villagers raised her dearly. They brought her to the village's guardian spirit on her fourth birthday. They wanted Muir to contract with the guardian spirit so the village would prosper. But when she made the contract, the guardian spirit ran wild. The flames that had protected the village now burned it down and the spirit also destroyed itself. Muir's power had the ability to drive a spirit mad. After being cast away by her village, she was picked up by the instructional school, where she became a «Monster». Her heart was lost, a «Cursed Armament Seal» was engraved on her young body, and she was taught nothing but slaughter techniques. Because of her in-born ability, Muir could never connect with a contracted spirit. Those days filled with only isolation and massacres slowly carved away her heart. In the middle of those days she met Kamito that had been taken to the facility. Seeing Muir alone, he offered to be her friend. She rejected it but Kamito instead asked to become her older brother.


Tempest ArcEdit

Muir attacks Kamito during the voyage to the Blade Dance location which ends when Leonora Lancaster leads a counter attack with her spirit Nidhogg. During the ceremonial dance, she attacked the girls of Team Scarlet with the military spirit Tiamat, and overpowers them, yet she is stopped by Kamito and Tiamat is defeated. She also was the main attacker during this stage in the Blade Dance instead of Ren Ashbell, Sjora Kahn, and Lily Flame.

Cross Fire ArcEdit

She obtains Valaraukar from Alphas Theocracy to fight on the Cross Fire. She uses Valaraukar and defeats an elementalist from the Knights of the Dragon Emperor and later summons it again to attack Kamito. During the fight she gets enraged by Ellis and pulls her body to its limits, after Kamito takes down Valaraukar for the first time, she loses control of it.

After the battle, she's taken by Kamito to talk. She explains that she has to be alone, demonstrating the power of the Jester's Vice; born with a power which the world rejects she chose to reject the world in turn. After Kamito goes to sleep, she silently bids goodbye and leaves her Magic Stone besides Kamito before being teleported out of the battlefield.

Spirit War ArcEdit

Muir and the rest of Team Inferno attacked Balsas Prison using the military spirit Ungoliant and released Jio Inzagi, Vivian Melosa and Velsaria Eva Fahrengart.

Abilities Edit


  • She, Lily Flame and Kamito were often in the same team of assassins.
  • Muir claims that the world hates her because all the spirits she makes contact with go berserk immediately due to her Jester's Vice power. So she rejects the world, rejects everyone. This is why the first meeting with Kamito is very important to her.
  • Probably from the harsh training in Instructional School, Kamito can't remember their first meeting. However, even after four years have passed, meeting her again in the Blade Dance final round, he treated her kindly as if she is his younger sister.

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