Arifureta (Main Series)/1st Season Blu-ray Short Story

Arifureta: From Commonplace to World's Strongest Blu-ray BOX Complete Volume Purchase Privilege "Eternal Artifact" (ありふれた職業で世界最強 Blu-ray BOX 全巻購入特典『悠久のアーティファクト』) is a short story light novel of the Main Series, written by "Ryo Shirakome".

It was only available by purchasing the complete Blu-ray Anime Boxset of Season one in Japan.

Synopsis
【グリューエン大砂漠）に最も近い町で物資を調達することにしたハジメたち. そこで「別世界に行ける」という「砂漠の逃げ水 』の伝承を耳にする. 大迷宮攻略を優先するが、道中、巨大な砂嵐に巻き込まれてしまう. どうにか脱出するも、その先で今度は『砂漠の逃げ水 』らしきものに遭遇. ハジメは伝承の真偽を確かめるべく飛び込んでいく. そこで目にしたのは……現代の日本！？さらには“生きた"アーティファクトまで現れ一 『待っている. ずっと、帰ってくるのを』 TVアニメシリーズとも繋がる、ここでしか読めない“最強”異世界ファンタジー！
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Hajime and his friends decide to procure supplies in the town closest to the "Gruen Great Desert". There, they hear the legend of "desert mirage" that "leads to another world". Priority is given to capturing the Great Labyrinth, but on the way, they get caught up in a huge sandstorm. They managed to escape, but after that they encountered something that seemed to be "desert mirage". Hajime jumps at the chance to confirm the truth of the legend. What they saw there was ... modern Japan!?? Furthermore, even a "living" artifact appears and one "I’ll wait. Forever, for their return." Connected to the TV anime series, The "strongest" different world fantasy that can only be read here!
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Chapters

 * Chapter I: デートとパートタイムの仕事 (Date and Part-Time Work)
 * Chapter II: 砂漠の伝説 (The Desert’s Legend)
 * Chapter III: 蜃気楼の世界 (World of Mirage)
 * Chapter IV: 悠久のアーティファクト (Eternal Artifact)

Trivia

 * The backstory of Ehit having been responsible for creating the Gruen Desert long ago is later touched upon briefly in Volume 11.
 * In Volume 5, it was originally stated by Hajime that Kaori could not drive his vehicle "Brise" due to it being designed to only work for those who can manipulate their own mana. This story retcons this fact, by giving Brise a feature that allows anyone with mana to operate it through a voice command.