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For other characters who have used Aihana Etsu's name, see Aihana Etsu (disambiguation).

Aihana Etsu (藍花 悦 Aihana Etsu?), also referred to as the Number Six, is the sixth ranked Level 5 esper in Academy City. A recurring joke in the series is the mystery surrounding their identity.


The three kanji for Aihana Etsu's name mean "indigo", "flower", and "pleasure", respectively.


This section requires expansion

NT12, GT2[1][2]


Shinyaku Toaru Majutsu no Index

Agitate Halation Arc

Main article: Agitate Halation Arc

During the riots in Academy City's Learning Core involving 7,500 "heroes", a group of people assume that a boy claiming to be Aihana Etsu is the Number Six since he defeated them with only his fists and without any apparent ability. Shokuhou Misaki, noticing him, claims that he is pretending to be the Number Six Level 5, and therefore has no connection to her, indicating that she probably knows the real Aihana Etsu.[3]

In the conclusion of the arc, Kihara Noukan states that "the Level 5s gathered in one place", hinting either that the real Aihana Etsu actually was present in Learning Core, that Noukan was simply only referring to the other Level 5s, or that Noukan was fooled by the impostor's acting.[4]

Magic God Othinus Arc

Main article: Magic God Othinus Arc

Aihana officially debuts in person in this arc, though their features are kept nondescript and they are referred to as the Number Six rather than by name. When Academy City sends an email to the seven Level 5s "requesting the death of Magic God Othinus and Kamijou Touma who is traveling with her", Aihana silently toys with the phone.[5]

St. Germain Arc

Main article: St. Germain Arc

Following the events at the Dianoid, during which Kanou Shinka made use of Aihana's name, the real Aihana speaks with Yokosuka, who has been assisting Aihana (hoping that he could learn how to beat Sogiita Gunha) with their plans of helping people solve their problems by allowing them to use Aihana's name as the sixth ranked Level 5 on Aihana's behalf, Yokosuka having passed the name on to another.[1]

Souyaku Toaru Majutsu no Index

Christmas Day Arc

This section requires expansion


GT Index v02 BW6

Aihana Etsu approaches Kamijou Touma

On Christmas Day, Aihana Etsu approached the heavily injured and dying Kamijou Touma, who was attempting to leave hospital to stop Anna Sprengel, despite his condition. Though he had negative view of Touma and had avoided making contact before then, Aihana apparently deemed supporting Touma with his power the best choice for fighting R&C Occultics. He attempted to have Touma take on his name and grant him power like he usually did with others, but Touma rejected his offer and called out his attitude. Both unwilling to budge, Aihana stood in Touma's way and was quickly knocked out.[2]

Toaru Kagaku no Railgun

Daihasei Festival Arc

Main article: Daihasei Festival Arc (Railgun)
Aihana Etsu - Name

Etsu's name on the clipboard.

The Number Six is mentioned when Yamane, who is part of a group tasked with convincing the seven Level 5s to hold demonstrations during the Daihasei Festival, tries to track them down, but he is unable to find any trace of them.[6]

Other Appearances

Side stories

Toaru Jihanki no Fanfare

Main article: Toaru Jihanki no Fanfare

Aihana Etsu is mentioned when a pirated broadcast lists off the epithets of the seven Level 5s. Humorously, they are introduced as "Eh, who's that Number Six...? Well, forget about it".[7]


This section requires expansion




  • "Now, picture the you that you wish to be. Picture your ideal self.”[...]“You can be that version of yourself. Now, I will lend you Aihana Etsu."[2]


The Seven Level 5 Espers of Academy City

Accelerator (Anime) Kakine Teitoku (Anime) Misaka Mugino-Railgun
#1 - Accelerator #2 - Kakine Teitoku #3 - Misaka Mikoto #4 - Mugino Shizuri
Misaki06 Aihana Etsu ambiguous pfp GunhaRailgunT
#5 - Shokuhou Misaki #6 - Aihana Etsu #7 - Sogiita Gunha
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