How the hell did she fake her death?

She was pinned to the wall with a stake through her heart.

Don't tell me she's Aizen's daughter.

Didn't she hypnotize them?

I really should get an avatar

I always assumed that if someone had bothered to touch her, they would have found that she was just wearing contact lenses and had a fake hole in her chest.

The moment I saw her dead body at the start (I actually started reading this less than an hour ago), I said "it's a trick."

The beginning reminded me a lot of Saw for one.
On top of that, like the game states, liars cannot be trusted.
Right from the start, we learn that she made a job of lying to people.
Heck, she was trying to lie to them right from the start.
Not to mention she was a "hypnotist."

Similar to what nekirhs said, after the first chapter I concluded that the villain would either be the protagonist because he seemed too innocent with false concern and such, or some supernatural stuff most likely involving the hypnotism girl.

Turned out I was right pretty much, the ending was completely nonsensical and pulled out of the author's ass. Really good stories have a conclusion that makes sense, not "yeah well they had superpowers and there were aliens so I don't have to explain anything because superpowers lol !!!!!". He could've ended the manga somewhere in the middle, too. People would be just as unsatisfied and it would've made just as much sense as hypnotism superpowers.

Edit: In case you ever check this thread again, thank you very much for your work, SnoopyCool.