紅の乙女

From Author Wars - https://authorwars.com/books/hong-noyi-nu-2971224.html

Overview:

Title: 紅の乙女
Author: 迷井豆腐
Year: 2018
Type: Novels
Series: 黒の召喚士 / Black Summoner
Number in Series: 6

Variant Titles:

2021. The Red Maidens