Toaru Majutsu no Index Wiki

Muu (むー ?), known as Muu-chan (むーちゃん Mū-chan?) to her friends, is a minor character introduced in Toaru Kagaku no Railgun. She is a Level 0 student of Sakugawa Middle School and is a user of the Level Upper.


She has short brown hair, with fringes that are parted slightly on the left side of her scalp. Though not often seen, she also seems to have a small fang.


She is currently enrolled in Sakugawa Middle School and is a classmate of Saten Ruiko and Uiharu Kazari. She is usually seen with her friends Akemi and Mako, both of whom are also in the same class as her.


Toaru Kagaku no Railgun

Level Upper Arc

Main article: Level Upper Arc

A shot from the anime showing her fang.

In the anime, she first appears in class listening to a lecture about Personal Reality.[2] She later appears alongside Akemi and Mako, wondering about the Level Upper and bemoaning the fact that she lacks enough money to afford its high price. They then run into Saten Ruiko, who has the Level Upper and shares it with them.[3] She then uses the Level Upper, allowing her to improve her abilities. Her next appearance is in a park, allowing Akemi to use her powers on her. Akemi forgets that she was using her abilities on Muu and drops her on the ground, making her mount Akemi's back as revenge (in the manga, she also tries to choke Akemi with her arm). In the anime, she practices her powers on cans and later runs to Akemi after the latter collapses due to her using the Level Upper. She eventually collapses as well as a result of using the Level Upper and is sent to a hospital.[1]

She reappears in the anime alongside her friends in a special class for users of the Level Upper. Later, she joins the rest of the students in running laps around the track as part of training under Yomikawa Aiho. During Ruiko's confrontation with Elder Sister, Muu is concerned about Ruiko's well-being but doesn't do anything. After Elder Sister leaves, she criticizes Ruiko for taking on Elder Sister and asks her if she knows no fear. She agrees with Akemi's statement about Ruiko saying that cheating is wrong. After the special class, she is told by Mako that her statistics rose and comments that her own rose as well. She later joins Akemi and Mako for a party to celebrate.[4]

Poltergeist Arc

Main article: Poltergeist Arc

She, alongside Akemi and Mako, appear briefly in a flashback where they celebrate Kazari's induction into Judgment. Her final appearance in the anime is in a park somewhere alongside Akemi and Muu, looking at Kiyama Harumi's birthday present that was prepared by her students.[5]

Dream Ranker Arc

Main article: Dream Ranker Arc

She appeared briefly in the background when Saten communicated via Speech Bubble with Frenda Seivelun.[6]


Her ability is never shown in the manga, but in the anime, she displays the ability to levitate a few cans off the ground after using the Level Upper.[3]

Character Art Design


  • She does not refer to Ruiko by her family name, instead using her given name; this indicates that she is very close to her.



v  e
Sakugawa Middle School
Uiharu Kazari Winter Clothing (Anime).png Saten Ruiko Winter Clothing (Anime).png Haruue Erii.png Akemi.png
Uiharu Kazari Saten Ruiko Haruue Erii Akemi
Makochin.png Muu profile.png Edasaki Banri Railgun S (Anime).png Fuuga.jpg
Mako Muu Edasaki Banri Sakurazaka Fuuga
Daigo sensei.png
v  e
Level Upper Users
Akemi.png Anego.png Juufuku Miho.jpg Junta (anime).JPG
Akemi Elder Sister Juufuku Miho Junta (Railgun anime)
Junta.JPG Kaitabi Hatsuya.png Template Placeholder other.png Koujun Kikuhiko.png
Junta (Railgun manga) Kaitabi Hatsuya Kawazaki Koujun Kikuhiko
Kushiro Katabira (Navbox).png Makochin.png Template Placeholder other.png Muu profile.png
Kushiro Katabira Mako Morimoto Futari Muu
Okahara Ryouta.png Template Placeholder other.png Saten Ruiko Winter Clothing (Anime).png Trick.png
Okahara Ryouta Oomura Jirou Saten Ruiko Trick