黒猫の親友と宝石の涙

From Author Wars - https://authorwars.com/books/hei-mao-noqin-you-tobao-shi-nolei-3038354.html

Overview:

Title: 黒猫の親友と宝石の涙
Author: 忍丸
Year: 2020
Type: Novels
Series: わが家は幽世の貸本屋さん / The Haunted Bookstore: Gateway to a Parallel Universe
Number in Series: 3

Variant Titles:

2022. The Black Cat's Old Friend and Gemstone Tears