魔女の世紀

From Author Wars - https://authorwars.com/publications/mo-nu-noshi-ji-623777.html

Overview:

Title: 魔女の世紀
Author: 金春智子
Year: 1984
ISBN-10: 4785944544
Publisher: 少年画報社
Price: ¥480
Binding: Paperback
Type: Novel
Title Reference: 魔女の世紀
Notes: Data from Amazon.co.jp
Amazon.co.jp lists it as a comic, but it is not a comic. The cover clearly states it is a novel (in Japanese and English), and various other listings (auctions, mostly) only list it as a novel. This is a novelization of the animated film.