Kuguru Uki (宇木くぐる Uki Kuguru) is a student attending the 6th-year elementary division of Aibo Academy. She is classmates with Gao Mikado and Baku Omori, as well as being a childhood friend of the latter. She's also a huge support to Gao, to the point of blackmailing Baku in order to get him to build a deck for Gao. She is nicknamed "The Library" due to her vast card knowledge and carries a tablet to display card