The Accuser and The Abyss

You are a detective who woke up with no memories and recollection of anything else but a case and your new partner.  Though you find nothing is wrong, you realize  your thoughts doesn't go outside a strange confinement.  You are to investigate a strange slaughter of a family by their daughter and her teacher.  But soon you realize the inspector you are paired with could be more insane than the perpetrators involved.  A linear story-rich visual novel with some choices.  Can you escape the prison set by the warden of this world?