KK is a spirit inhabiting Akito's body, allowing him to fight against dangerous spirits called Visitors. Akito is searching for his sister, Mari, and a man with a Hannya mask, as that is the person who abducted her from her hospital room. KK does talk occasionally, but Akito speaks the most. Tokyo has been in this state for a day now, the mist is blocking the rest of the world. The mist kills all who touch it. You’re stuck, just the three of you, in Tokyo, alone.