Libido Doujin

Libido Doujin is a shounen doujinshi store that presumably specializes in adult material.

The store is held hostage by a group of Orcs calling themselves the Orc Culture Recultivation League in the manga series. Demanding that Japan increase the amount of Orc-oriented content in mainstream erotic manga, the Orcs held the store staff at gunpoint until they were defeated by the Monster Ops: Neutralization squad.

Trivia

 * In the anime series, a Comic Toranoana store is held hostage instead of Libido Doujin.
 * The shop clerk of Libido Doujin bares a remarkable resemblance to Junji Onodera of MaMaMa: Magical Director Mako-chan’s Magical Guidance.