Light Novel Volume 8/Synopsis

Prologue: The Never-Ending Labyrinth
Naofumi woke up to find that he got separated from his party, save for Rishia. In this unknown world, they turned back to level 1 and their equipments from their original world are rendered useless. They went to do some level-up but ended up being cornered by monsters and being saved by a hero. After introducing themselves to each other, the hero, Kizuna Kazayama confirmed that she is a hero from Glass' world but currently trapped in this labyrinth world. After remembering what happened after he jumped into the portal, Naofumi realized that he arrived in this labyrinth world and got separated from Raphtalia and Filo because they were trapped by Kyo when crossing to Glass' world.