Sorashi Daisansekai

Sorashi Daisansekai (第三世界 空思, Daisansekai Sorashi) is a beast of reality and surreality that guards the entrance of Shikoukuukan.

Personality
Sorashi is calm and leading towards people from Shikoukuukan, or people that can enter Shikoukuukan. She acts arrogant towards intruders.

Switching between reality and surreality
Sorashi's power to replace real objects with surreal counterparts or switch a section of space to the reversed reality.

Mathematics manipulation
Sorashi can interpret maths into danmaku such as the function curves.

Name
Her full name is Sorashi Daisansekai (第三世界 空思). Daisansekai means "third world".Sorashi is a common girl name.

Design
Sorashi' has purple clothes and blue shoes with purple eyes and brown hair. In surreality, all the colors invert.

The Incident of The Strange Moon
Sorashi appears on stage 5 of the incident, as she tries to stop the heroines from approaching into Shikoukuukan.

The Incident of The Divine Mountain
Sorashi appears in the extra stage of The Incident of The Divine Mountain as the 3rd midboss. Based on your Life/Death subshot in the extra, her spell amount and difficulty changes.

Chigawajin's Nightmare
Chigawajin, on Midoriyama route, fights twice with Sorashi, one alone, and the other combined with Akabana.

Akabana
Akabana is a beast inside Shikoukuukan, and Sorashi is often seen pairing with her.

Junkumosora Raijin and Kyokatsu Yamiame
Sorashi might be Junkumosora's underling, if she is, she is probably an underling of Kyokatsu as well. On Kyokatsu's stage, Sorashi was the 3rd midboss.

===Reimu Hakurei, Marisa Kirisame, Sanae Kochiya, Sakuya Izayoi, Reisen Udongein Inaba=== The protagonists of The Incident of The Strange Moon, Reimu, Marisa and Sanae, are known by Sorashi really well. Sakuya and Reisen are only known from the 2nd incident, so she doesn't know them well.