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Is It Wrong to Try to Pick Up Girls in a Dungeon? On the Side: Sword Oratoria

Dungeon ni Deai wo Motomeru no wa Machigatteiru no Darou ka Gaiden: Sword Oratoria
ダンジョンに出会いを求めるのは間違っているだろうか外伝 ソード・オラトリア
소드 오라토리아(던전에서 만남을 추구하면 안되는 걸까 외전)
DanMachi – La légende des Familias
Может, я встречу тебя в подземелье? Меч Оратории
มันผิดรึไงถ้าใจอยากจะพบรักในดันเจี้ยน ภาคพิเศษ Sword Oratoria
在地下城尋求邂逅是否搞錯了什麼

Main Story

novel
and 1 more
In Orario, fearless adventurers band together in search of fame and fortune within the monstrous underground labyrinth known as Dungeon. 

But while riches and renown are incentive enough for most, Bell Cranel, would-be hero extraordinaire, has bigger plans. 

He wants to pick up girls. 

Is it wrong to face the perils of Dungeon alone, in a single-member guild blessed by a failed goddess? Maybe. Is it wrong to dream of playing hero to hapless maidens in Dungeon? Maybe not. After one misguided adventure, Bell quickly discovers that anything can happen in the labyrinth--even chance encounters with beautiful women. The only problem? He's the one who winds up the damsel in distress! 

(Source: Yen Press)

Adaptation

manga
A side story of Dungeon ni Deai o Motomeru no wa Machigatte Iru Darou ka. It covers the story of the strongest 1st class adventurer "Sword Princess" Ais Wallenstein and her desire to reach even greater heights with her friends in the Loki Familia.