モンスターのご主人様15

From Author Wars - https://authorwars.com/books/monsutanogozhu-ren-yang-15-3231928.html

Overview:

Title: モンスターのご主人様15
Author: 日暮眠都
Year: 2019
Type: Novels
Series: モンスターのご主人様 / Monster Tamer
Number in Series: 15

Variant Titles:

2023. Monster Tamer 15