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.

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)

Contrary to what the adventures of Bell and the Goddess Hestia might imply, not everyone goes into the dungeon of Orario to pick up girls. The veterans of the Goddess Loki’s Familia have lots of reasons for risking life and limb facing the monsters and mayhem lurking within the deadly labyrinth’s multiple levels, but new member and mage Lefiya just wants to prove that she’s worthy to be on the same team as her hero, the famed sword princess Ais Wallenstein. As for Ais herself, she’s seeking something that no one else even suspects, and she may find it when trouble comes after her from the previously unreached 59th level! 
 
(Source: Sentai Filmworks)

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