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The Monster's Twin Sister, and the female Protagonist of the series.
Anna is the twin sister of Johan who attempted to take his life after he murdered their foster parents when she was 11. Her memories of her past were repressed thanks to this event and she took on a new life under the name of Nina Fortner. Nine years later, Anna was a college student living happily with her two adoptive parents. However, Johan returns in her life once again which results in the murder of her adoptive parents, the slow return of her past memories, and her encounter with Dr. Tenma. Anna sets out to find the whereabouts of her brother to avenge the loss of her parents and learn more of her lost past.