It’s time for class 1-A to start getting ready for the end-of-the-year holidays, and that means undertaking a winter cleaning. The unsuspecting students get a big surprise when their cleaning leads to a crazy discovery. What’s this mysterious entrance?! They have no choice but to rustle up some Plus Ultra spirit and venture inside!

Original Story by Kohei Horikoshi, Written by Anri Yoshi
Release October 5, 2021
ISBN-13 978-1-9747-2407-9
Trim Size 5 × 7 1/2
Length 288 pages
Category Novel
Age Rating Not Rated