六花団円

From Author Wars - https://authorwars.com/books/liu-hua-tuan-yuan-3231515.html

Overview:

Title: 六花団円
Author: 三屋咲ゆう
Year: 2022
Type: Novels
Series: 学戦都市アスタリスク / The Asterisk War
Number in Series: 17

Variant Titles:

2023. The Grand Finale