Demon World Arc

The Demon World arc is the second story arc in the series. The manga takes place during Chapters 41-47 while the anime follows Episodes 23-24. The story revolves around how Oga, Furuichi, and Be'el are inadvertently sent to the Demon World along with Furcas Rachmaninoff and Lamia.

Synopsis
Spoiler warning: Plot and/or ending details follow.