Kei's estranged childhood friend. He helps Kei escape from his pursuers after finding out that he was an Ajin, even though Kei hasn't spoken to him in years. After he finds out Kei has run away he immediately decides that he has to go help Kei. And as Kei and Kai are running away they come across a ton of nuisances. He doesn't consider Kei an Ajin, but a human.