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The following content contains spoilers. Please proceed at your own risk.
Caligula EPISODE: Marie Mizuguchi ~The World She Saw~ (カリギュラ EPISODE水口茉莉絵~彼女の見た世界~) is a side novel of The Caligula Effect.
The novel begins right after μ is defeated by the Go-Home Club and she regains her senses. Once she begins sending everyone home, she realizes that one person remains: the Protagonist, who, due to lingering regrets about not truly understanding Marie Mizuguchi and her actions during the Wicked incident, is unable to let go of Mobius just yet. μ offers him two options: be forced back to reality by μ and forget his regrets about Marie or take μ's hand to learn about Marie.