[3] A manga adaptation illustrated by Naoto Ayano began serialization in the October 2009 issue of Kadokawa Shoten's Comp Ace magazine.

The anime has been licensed in North America by Sentai Filmworks; distributor Section23 Films announced that it would release the complete box set on January 11, 2011.

After several similar occurrences, they encountered four other people affected by the phenomenon: Misuzu Kusakabe, a red-haired swordswoman and onmyouji; Kukuri Tachibana, a silent girl who physically resembled Kakeru's deceased sister and shared her name; Yukiko Hirohara, a cheerful girl who transforms into a cold killer when her glasses are removed; and Takahisa Tajima, a pyrokinetic with a fiery personality.

Kakeru, wanting to repay Yuka's kindness and support, struggled to awaken his own latent power, which Misuzu assured him would eventually manifest.

The situation became more complex when the group discovered a girl named Lisette trapped within a red crystal, guarded by the Black Knights.

This time they meet a strong young woman named Misuzu Kusakabe, a senior at Rainbow High who saves them from a horde of the evil nightmarish creatures using a lightning sword.

The trio then try to make their way to the crystal towers in the center of the city, which according to Misuzu are full of powerful energy, for a chance of escape.

The trio are attacked by some much-stronger adversaries, earning them the name of "Black Knight" due to their blackish appearance but once again find themselves returned to the normal world.

Downstairs in the living room, Misuzu and Takahisa discuss Yuka's power, the Red Night and the reason they are chased by the Black Knights.

After Takahisa leaves to in search of Yukiko, Misuzu checks the oni barrier around her house, which shows hairline cracks.

Shiori comes and tells Kakeru and Misuzu everything about the Red Night and about the Black Knights, revealing herself to be a young magician and librarian of a secret magical organization called the Index.

If all the fragments of her soul are recollected into Liselotte's body, she can grant her wish to destroy the world by sending it into Hell via the black moon.

[9] Chris Beveridge from Mania.com compared it with Venus Versus Virus, and noted 11 Eyes "has some nice ideas but didn't execute it well".