Alti

Alti is a Sibylla of Chor Tempest.

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Alti is a sixteen year old citizen of the advanced nation of Simulacrum. She is the younger twin sister of Kaimu, a fellow Simoun Sibylla. Alti is serious and focused, similar to Kaimu, yet is not as indecisive and shy, being more of a strong-minded individual. The two of them were both assigned to Chor Tempest upon graduating from Simoun training.

Alti and Kaimu do not get along for the majority of the show. It is revealed that in the past, the two of them had a sexual encounter when they were afraid of a thunderstorm and were struggling with anxiety. This experience changed both of them. It made Kaimu angry at her sister, and hesitant to be sexual with anyone else, even her piloting partner Paraietta. Alti, however, experienced grief as she witnessed her relationship with her sister crumble and fade away. She felt saddened and helpless, and is shown to be troubled a lot during the show. However, by the end of Simoun, the two of them have talked over their differences and reconciled, realizing their past mistakes should not affect their future and friendship as siblings.

Alti's piloting partner is Floe. Although the two of them are not a couple, they are good friends and veterans compared to the rest of the cast.

Alti chooses to remain female in the gender-selecting process, and lives out the rest of her days peacefully with Kaimu at their old home mansion.