Invaders of the Rokujouma!? Collector's Edition 4

From Author Wars - https://authorwars.com/books/invaders-of-the-rokujouma-collectors-edition-4-2972756.html

Overview:

Title: Invaders of the Rokujouma!? Collector's Edition 4
Author: Takehaya
Year: 2021
Type: Omnibuses

Editions/Publications:

2021 . Invaders of the Rokujouma!? Collector's Edition 4 (2021, Takehaya, J-Novel Club, ISBN-10: 9781718308336, $29.99, 600 pages, Trade Paperback, Omnibus)