UQ Holder! Volume 21 was released in Japan on October 9, 2019 by Kodansha. This book is part of the series about Touta Konoe, the grandson of the Masigter Magi, Negi Springfield. The series is a sequel to Negima! Magister Negi Magi.
Volume 21 of the on-going series focusing on Touta, the grandson of famed Mage, Negi Springfield, and his adventures of working with the group of immortals, UQ Holder, and his journey to find his purpose in life.
This is a standard volume for the series and includes a colored sleeve around the book itself. The manga is printed in the standard black-and-white.