"Is It Wrong to Try to Pick Up Girls in a Dungeon?" is set in the fictional city of Orario, a bustling hub where adventurers gather to explore the Dungeon, a vast labyrinth filled with monsters and treasures. The world operates under a system where gods and goddesses, who have descended to the mortal realm, form Familia—groups of adventurers who pledge loyalty to them. These Familia members gain strength and abilities through the blessings of their patron deity, represented by a Status that evolves as they grow stronger.

The protagonist, Bell Cranel, is a young and inexperienced adventurer who belongs to the Hestia Familia, led by the goddess Hestia. Bell is driven by a desire to become stronger and to prove himself, inspired by a chance encounter with a powerful female adventurer, Ais Wallenstein of the Loki Familia. Bell’s journey begins with his struggles in the Dungeon, where he faces constant danger due to his lack of experience and strength. However, his determination and unique skill, "Realis Phrase," which allows him to grow stronger at an accelerated rate when motivated by intense feelings, set him apart.

As Bell progresses, he encounters a variety of characters who shape his journey. Hestia, his goddess and Familia leader, is deeply devoted to him and provides emotional support, though her overprotectiveness often leads to comedic situations. Ais Wallenstein, a renowned swordswoman, becomes both a source of inspiration and a romantic interest for Bell, though their relationship is complicated by her stoic demeanor and his admiration for her. Other key characters include Eina Tulle, Bell’s advisor at the Guild, who offers guidance and support, and Lilly, a supporter who initially deceives Bell but later becomes a loyal ally.

The narrative explores Bell’s growth as an adventurer, his interactions with other Familia, and the challenges posed by the Dungeon’s increasingly dangerous floors. The story also delves into the politics and rivalries between Familia, as well as the mysterious origins of the Dungeon itself. Themes of camaraderie, perseverance, and self-discovery are central, as Bell navigates both the physical dangers of the Dungeon and the emotional complexities of his relationships.

The series balances action, humor, and character development, with a focus on Bell’s journey from a novice adventurer to a capable and respected figure in Orario. The Dungeon serves as both a literal and metaphorical backdrop for his growth, presenting ever-evolving challenges that test his resolve and abilities. Through his experiences, Bell learns the value of trust, friendship, and the importance of striving for one’s goals, even in the face of overwhelming odds.