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Iris Sagan, professionally known as A-set. Is a main character in AI: THE SOMNIUM FILES and AI: THE SOMNIUM FILES - nirvanA Initiative. In an alternate timeline version of her, she the protagonist of the Lemniscate YouTube series.

Iris is an internet idol and musician affiliated to the entertainment office Lemniscate. Iris is a bright and cheerful young woman whose energetic optimism perseveres throughout all the content she produces, from her online videos to her 'To-Witter' account. Her determination pushes her to train and do dance practice on various days of the week. Despite this up-beat personality, she often talks about murder or creepy urban legends. She is also capable of blackmail, so it is possible that she is actually cunning, despite how she might come off.

In AI: THE SOMNIUM FILES, Iris is a key witness, suspect, and victim of the New Cyclops Serial Killings case. In nirvanA Initiative, Iris and Mizuki were present at the studio when the right half of a body suddenly appeared during the webcast of a game show.