"Is It Wrong to Try to Pick Up Girls in a Dungeon? Days of Goddess" is a spin-off manga series set in the same universe as the main "DanMachi" series. The story centers on the goddess Hestia and her Familia, exploring their daily lives and adventures in the city of Orario. Hestia, a minor goddess who struggles to maintain her Familia, takes on a more prominent role as she navigates the challenges of managing her followers while dealing with the complexities of divine politics and rivalries among other gods and goddesses.

The narrative delves into the dynamics within Hestia Familia, particularly focusing on the relationships between Hestia, Bell Cranel, and other members. Bell, a young and inexperienced adventurer, serves as the Familia’s primary adventurer, striving to grow stronger and prove himself in the dangerous Dungeon. Hestia, deeply devoted to Bell, supports him emotionally and spiritually, often going to great lengths to ensure his safety and success. The series also introduces other key characters, such as Welf Crozzo, a blacksmith with a unique ability to create magic swords, and Lili, a supporter who aids Bell in his dungeon expeditions.

The plot intertwines slice-of-life moments with action-packed dungeon exploration, offering a balance between lighthearted interactions and high-stakes battles. Hestia’s efforts to expand her Familia and secure resources often lead to humorous and heartwarming situations, while the dangers of the Dungeon and the machinations of rival Familias add tension and conflict. The series also explores the broader world of Orario, including the interactions between gods, adventurers, and the city’s inhabitants, providing a richer context for the events of the main series.

Themes of loyalty, perseverance, and the bonds between gods and mortals are central to the story. Hestia’s unwavering dedication to her Familia and Bell’s determination to grow stronger drive much of the narrative, creating a compelling dynamic between the characters. The series expands on the lore of the "DanMachi" universe, offering fans deeper insights into the lives of its characters and the world they inhabit.