Shouta was taken hostage for money at first, but then his captors found a better use for him and started experimenting on him. Over the course of three years his body has been altered through drugs, surgery and torture. He no longer needs to sleep, and his human eyes have been cut out and replaced with something more reptilian. He has a speech impediment due to brain damage from repeated amateur surgery: it's hard for him to translate his thoughts into words when he's upset or angry.