Mimsy's fiancé. Slay serves as the secondary operator of the Glomar whenever Shaya takes a break or if the ship is not on auto-pilot. Slay highly dislikes Kei, blaming him for all the trouble and loss of the Glomar's crewmembers from the Chilam because of his status as a Tokuiten. Slay also dislikes Kei for forming a romantic relationship with Mimsy, making them rivals for her affections.