Kinda like Tokyo Girls Destruction.

A hidden gem, very good manga

Holy shit this was fucking stupid

Science fiction be like "i wished that it existed so it existed". Yo amazing narrative resource to explain the existance of a place where time doesn't flow.

nothing in this manga makes any sense

Tokarev did nothing wrong.
If Hiroko hadn't gone to Shishin Academy, a lot of the problems wouldn't have happened, she wouldn't have helped some girls escape and they wouldn't have died during the attempt, Ayaka wouldn't have gone to the Academy and of course Hiroko wouldn't have killed her own sister, who she was supposed to save.
I really liked the story, but the ending is just...
Ayaka didn't save Hiroki, Hiroki killed his sister and that was bad for the girls admired her, we don't even know what effects it will have on the Academy.
I would rather Ayaka and Hiroki accepted Tokarev's proposal.

My Theory about the ending: Hiroko did not kill Tokarev, and just shot her unconscious, my reasons to think this is because neither her body have any blood nor Hiroko could do it(the whole manga exists because she wanted to save her little sister). Instead, i guess since Hiroko could not save Tokarev, she choose to go along with her sister's wish and stay there with her and the other students forever, because Ayaka would never submiss to Tokarev(to who even Hiroko was already submissive) , Hiroko let her be free(though i really think Ayaka would rather stay there with her, even if it means living with Tokarev as well ¬¬).

Raytraza I prefer your theory to what I understood and I agree that Ayaka would have stayed at the Academy.