蠢く闇

From Author Wars - https://authorwars.com/books/chun-kuan-2981138.html

Overview:

Title: 蠢く闇
Author: 迷井豆腐
Year: 2018
Type: Novels
Series: 黒の召喚士 / Black Summoner
Number in Series: 7

Variant Titles:

2022. The Creeping Darkness