六畳間の侵略者! ? 20

From Author Wars - https://authorwars.com/books/liu-die-jian-noqin-lue-zhe---20-2569383.html

Overview:

Title: 六畳間の侵略者! ? 20
Author: 健速
Year: 2015
Type: Novels
Series: 六畳間の侵略者!? / Invaders of the Rokujouma!?
Number in Series: 20

Variant Titles:

2019. Invaders of the Rokujouma!? 20

Genres/Themes:

young-adult fantasy