: This is the original source material written by Shinta Fuji and illustrated by Susumu Kuroi , with six volumes published under the MF Books imprint. Collectible Paper Goods
: The manga adaptation features art by Masaki Kawakami and was collected in six tankōbon volumes. You can find full sets, like the Vol. 1-6 Manga Set at eBay - japan_comic_happy . Ningen Fushin no Boukensha tachi ga Sekai o Suk...
: While often made of tinplate, manufacturers like Contents Seed produce character badges that are frequently packaged with high-quality cardstock backing. Go to product viewer dialog for this item. : This is the original source material written
Ningen Fushin No Boukenshatachi Ga Sekai O Sukuu Youdesu Vol.1-6 Set 1-6 Manga Set at eBay - japan_comic_happy
Since this series is heavily centered around the characters' niche hobbies—like obsession with idols and Tiana’s love for gambling—there is a variety of official "paper" merchandise and printed media available. Manga and Light Novels
It sounds like you're looking for high-quality paper goods or the manga/light novel for ( Apparently, Disillusioned Adventurers Will Save the World ).