Board Thread:4. General Discussion/@comment-33442194-20171022041858/@comment-30530564-20171027132100

Regarding this fact, I got my own version of this theory which collides and structures itseld on some of the points u marked as well.

Aoi, as Kanata (Rou Persona) himself, took surgery to get ESP skills. The one she got allows people's soul to reincarnate, more or less, at the user's will. So, she kills Tanaka.

As she (in her mad stalker's point of view) considers that Mayumi has a physical appearance that would attract Kanata again on the new world, Aoi kills her and then kills herself, to get Mayumi's looks (body) with her soul (mind) on her, and puts her on the same spot that Kanata went (same cave, same generation).

Though, this had a backslash. Aoi's body was left empty and, since she was already dead and could not control her skill anymore, Mayumi's soul went in and reincarnated as well. The world was the same as both the other 2 but on a different location and time. She reincarnated as Rubellia (Redhead).

The thing is that, somehow, the skill to reincarnate had only a partial effect on both Mi and Rube, leaving them with feelings towards Rou but none of their memories, unlike him.

That may be due to the body changing thing: the skill allows a target to fully reincarnate, mind and body, keeping his old self untouched (aside from the death itself, needed to trigger the skill). If weird conditions are met (body swapping) the reincarnation procedure will be affected (memory loss).

There you go.