Is it wrong to try to pick up girls in a dungeon? manga

"During the frenzied festival, Bell and Hestia find themselves in a tight spot thanks to the scheming of a shadowy someone working behind the scenes. When hijinks turn dangerous, will Bell manage to summon the strengh to protect those he cares about? And who's doing all this scheming anyway?!" -- back cover.

"With the help of his supporter, Lilliluka, and with his keen desire to become stronger burning within him, Bell Cranell reaches level ten of the Dungeon. The monsters they discover in that foggy place are terrible hulking brutes--orcs! Bell plunges into battle when something different attacks him from behind--but what? Magic, betrayal, and the forging of new bonds, all in the fourth volume of this familia myth--lived by the boy and chronicled by...

"Pursuing his desire to become stronger, adventurer Bell Cranell has become pupil to the brilliant swordswoman Aiz Wallenstein. Though he initially despairs about the vast gulf between their abilities, he gradually begins to improve. And as he does, a certain goddess's devious plan advances, and with it, a dark shadow approaches. The familia myth--walked by the boy and written by the goddess--continues!" -- provided by publisher.

Bell's adventures in the dungeon continue in this eighth installment of the massively popular manga adaptation of the original light novel series!

A monster has spawned on the (supposedly) safe eighteenth floor! Black Goliath falls upon the Under Resort and its unprepared inhabitants. Has it awoken because the gods have dared to trespass in the Dungeon? Bell, Hestia, and their mismatched team of gods and adventurers prepare to fight this unexpected floor boss...!