In a world full of indescribable creatures, humans undergo metamorphosis, changing them into their true personalities or where they have directed their lives over the years. The creatures do not talk, and once a human is out of metamorphosis, they stand like a statue until the end of time. Until today, when they started to move and went on a killing spree. Metamorphosis might happen at age 13, so you might become one of them, or have to survive the rest of your life with them.