Eta/Chronology

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Volume 1

Assault on Viscount Grease's Base

After her master's elder sister, Claire Kagenou was abducted by Viscount Grease from the Cult of Diablos, Eta participated in the assault on the secret base where Claire was being held, along with her lord and the rest of the Seven Shadows. They managed to rescue Claire after they eliminated all Cult members and the leader of the branch base. Afterward, Eta would join her sisters in leaving Shadow for a duration to expand their influence to keep apace with the Cult's power.

Volume 2

Bushin Tournament

At the beginning of the Bushin Festival, Eta, Gamma Nu, Chi and Omega change Cid's face using a slime base and mechanical alterations. With Shadow in the disguise that suits his needs, she retired to resume sleeping, wheeled off on a box dolly.^{[ANIME ONLY]}

By the end of the festival, Eta communicated with the other Shadow Garden members in Oriana Kingdom using Morse code. Establishing a coded covert communications network across the continent.

Volume 3

Red Moon Incident

Eta was theorizing about the similarity between the Possession and the Vampire Progenitor's blood, and informed Beta to look for information in the Crimson Tower of the Lawless City. Afterward, they started preparing an operation because their master intended to go there.

After the Blood Queen's rampage ended, Beta was able to recover the sample of Progenitor's blood and had already collected information from the tower's library to study further of her own theory's research of Possession.

The research was proven successful as Alpha was able to use the 'Red Mist Form' technique. Able to use use it against John Smith later, and Zeta using 'Black Mist Form' during her fight with Delta.

Great Trading Company Conflict

Following the events of Delta's disappearance, Eta was given an encrypted message by Shadow from Beta written in an alien language (Japanese). After Eta decoded the message, it was discovered that the message was Shadow's explanation on his "betrayal" and the deciphered parcel was forwarded to Alpha and the other Seven Shadows.

Volume 4

Oriana's "Black Rose" Wedding

In the anime, hearing an urgent report from the Oriana Kingdom that the Black Rose has been activated, Eta tries to suggest to Alpha to send a ship, but fears that the capital will probably fall before it arrives. However, Alpha calms Eta down by saying that Shadow is there to save Oriana from the Cult of Diablos.

Return to Earth

After Beta returned from her adventure in another world with Shadow, she brought an alien inhabitant from that world back with her. Alpha subsequently placed the Otherworlder under Beta's protective custody out of fear of what Eta would do if she got her hands on the alien.