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 ¬¬). I really enjoyed it and tough it would have a way greater ending, and LOTS more of explanation, the last chapter explain little to nothing, at the the start of the manga, it would get a 10/10 from me, but the lack of explanations and ending reduced it to a 7/10. This manga heavily needed more chapters and a epilogue, like, really? You'll never see your beloved one again and you write a damn novel? and WTF happened with Higoromo who also escaped?Did she and Ayaka became best friends?lovers?wife and wife? Only the author knows...*sigh* Sadly, i don't think this manga lacked yuri, actually, it was full of it, pretty much every girl is gay, the really sad part is that it seems most of the (rare) yuri mangas with a plot not only focused in the romance have a rushed or unsatisfaying ending :\