Titled “Onaji Sora no Shita de”, the main title theme is performed by Iguchi Yuka, who also voices Chigusa Hitachi in the TV anime.
Originally written by Omori Fujino and illustrated by Yasuda Suzuhito, Is It Wrong to Try to Pick Up Girls in a Dungeon? is a light novel series that has over 10 million copies in print. As well as a manga serialized from 2013, it was adapted into an anime in Apr. 2015, with a spin-off titled Sword Oratoria also receiving an anime in Apr. 2017.
(C)Omori Fujino, SB Creative / DanMachi movie production committee