In the story, μ, a virtual idol who performs user-inputted songs, gains self-awareness through exposure to users' bitter feelings and dissatisfaction toward reality. Wanting to save humanity — which she believes is continuously suffering — she lures people to a virtual reality world called Mobius with her songs. She then imprisons them in Mobius, thinking they will be free from the suffering of reality and that all their wishes will come true. The game follows the nine members of the "Going Home Club," a club that was formed because the characters want to escape from Mobius and go home. The game's title refers to the "Caligula Effect," which is a pattern of behavior where one wants to see or do something more if it is denied to them.
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