The light novel series has been adapted into an anime series, which was animated by J.C. Staff and aired from April 2015 through June 2015. An OVA was also announced. The series has been also adapted into an ongoing manga series, which began serialization in Young Gangan in 2013. A spin off manga, Dungeon ni Deai wo Motomeru no ha Machigatteiru Darou ka 4koma Kamisama no Nichijou, was published on Gangan Online from August 2014 to May 2015, and is currently being published again from May 2016 as Season 2.
Longing for a meeting like those in stories, Bell Cranel of the Hestia Familia is attacked by the Minotaur. Unable to do anything, he is saved at the last moment by First Class adventurer Ais Wallenstein. Bell fell in love and began to train himself so that he could one day become an adventurer worthy of her. (Volume 1)
With Realis Phrase and the Hestia Knife, Bell was on the path of becoming stronger. He formed a party with Liliruca Arde who was after his knife, but she was captured by some of her her fellow Familia members and used as a decoy. Bell saved Lili and won her trust. (Volume 2)
Bell trained himself even more with Ais' training and the acquirement of magic. Having himself set in Freya's sights, he is forced to fight a trained Minotaur. Having overcome his past trauma by defeating the Minotaur, he put out a new record and leveled to Level 2. (Volume 3)
After setting a new record, Bell gained the attention of those around him. While getting new armor, he decides to form a party with the smith Welf Crozzo. (Volume 4)
Bell and his party are stranded in the dungeon and head to the safe zone on the 18th floor. They spend some time with Hestia and the others that came to rescue them. However, Hestia is kidnapped by other adventurers and an irregular Monster Rex appears. With the support of over 100 adventurers, Bell defeated the Monster Rex. (Volume 5)
Following the incident on the 18th floor, the God Apollo set his sights on Bell. He tried to make Bell his own through many plans but ultimately lost to the Hestia Familia in the War Game and was forced out of Orario after losing everything. (Volume 6)
A 13 episode anime adaptation was produced by J.C.Staff and directed by Yamakawa Yoshinobu, and aired in Japan from April 4, 2015 to June 27, 2015. The anime was collected into seven DVD and Blu-ray Disc sets which are scheduled to be released from June 24 to December 23, 2015. The anime covered the first five novels in the series. An OVA was announced on February 21, 2016, and will be released on December 7, 2016.