is a Japanese light novel series written by Chinkururi and illustrated by Yasutaka Isekawa. It originally began serialization as a web novel on the Shà Âsetsuka ni Narà  website in January 2016, before Micro Magazine published nine volumes in print under their GC Novels imprint from November 2016 to August 2020. A manga adaptation illustrated by Syuu Haruno began serialization in Micro Magazine's Comic Ride online magazine in March 2018 and has been compiled into thirteen volumes as of December 2025. The manga is licensed in English by Kaiten Books. An anime adaptation has been announced.
Heihachi Okura, a man addicted to gacha games, is a fan of the mobile game Girls Corps. One day, while playing the game, he receives an item that claims to be an invitation to be sent to another world. Initially being skeptical about rolling this ultra rare item, he is suddenly summoned to another world, where he is immediately attacked by a monster. After escaping, he summons Norl Fanya, a helmeted knight who thrusts him into a tutorial scenario. Upon beating the tutorial, he starts traveling with Norl, with Norl being thankful for him summoning her.
Written by Chinkururi, Gacha Girls Corps initially began serialization on the user-generated novel publishing website Shà Âsetsuka ni Narà  on January 25, 2016. It was later acquired by Micro Magazine who published nine volumes with illustrations by Yasutaka Isekawa under their GC Novels light novel imprint from November 30, 2016, to August 31, 2020.
A manga adaptation illustrated by Syuu Haruno began serialization in Micro Magazine's Comic Ride online magazine on March 30, 2018. The manga's chapters have been compiled into thirteen volumes as of December 2025.
In December 2020, Kaiten Books announced that they had licensed the manga adaptation for English publication. The series was added to Azuki in June 2021 as a launch title.
An anime adaptation was announced on May 29, 2025.