Shiroe and his friends have come to the Depths of Palm to reach the Sacrifice Clan's gold.  The underground labyrinth is filled with powerful monsters that wear them down in a war of attrition.  Meanwhile, Akihabara, Akatsuki hears about the "Teachings".  She's very interested to know that by completing a high level raid, she can greatly improve the level of her techniques.
It's convenient that we can go underground.
Sich im Untergrund zu verstecken,
mag zwar praktisch sein, …
Es conveniente que podamos ir bajo tierra,
C’est bien beau
de rester planqué sous terre,
Essere nel sottosuolo è indubbiamente un vantaggio.
É conveniente seguirmos pelo subsolo,
Под землёй довольно удобно прятаться,