The murder has been solved and Santa becomes the newest addition to UQ Holder. Soon after, Tōta encounters a woman who claims to be a friend of his grandfather’s. She invites Tōta to enter the legendary Mahora Martial Arts Tournament, hoping he can help solve a peculiar mystery: Someone else has entered the tournament and his name is Negi Springfield.

First published in Japan in 2015 by Kodansha LTD., Tokyo. This book reads from right to left.