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Train Death
Aya may have caused a train accident and feels deep regret for it (possibly belated to the injury of Aine). She holds a scythe as an effect, the symbol of death a Shinigami or Grim Reaper holds to reap the souls of the dying, along with trains and train tracks being in multiple areas.
Aine is Aya's daughter
Judging by place with pregnant girl, embryo, and fact that Aine has almost the same apperance like Aya, she can can be Aya's daughter, in theory Aya dated a guy with mask, coloured in black. But when he ended this relationships unfortunately Aya was pregnant, since she she was too young to be a lonely mother when Aine is been born Aya just left her somewhere else, probably she in guilt in that Aine has only one arm, judging by dreams Aya have regrets from what she did.
Aya is a Murderer
Judging by ending of version 0.004 and 0.005a, Aya is in the prison because she killed a girl named Indigo, who gives the effect of the same name. Her little doll is proving this; after few credits screen, there will be Aya's cell with a doll stained a bit by blood, also blood trace can be seen from the opened door. But what about Indigo and why did Aya kill her? Well, Indigo can be former best friend of Aya in real life, they were so friendly that Aya even made the doll version of Indigo, but then happened something big. Indigo stole Aya's boyfriend, the guy in black mask, and there is even proof of it. Aya can get Indigo effect ONLY after entered in her tent while using Black effect. But if she uses any other effect or enter in tent without effects, she just returns in tent with a doll. For what the motives Aya had for this murder, one of the reasons could be an obvious revenge for betrayal. But there is something more. If Aya is actually Aine's mother, it can be guessed that Black knocked up Aya and left her with Indigo. But Aya couldn't accept this and she decided replace Indigo by herself. Proofs to this theory is, first one, Aya's dream self (aka Shiraya) has a long white hair just like Indigo. Se