How to Build a Dungeon: Book of the Demon King

Overview

Based on "Hidarikiki no Eren". The main character of the story is Ryoma Kobayashi, who works as a new employee at Moonlight, a major entertainment agency. Kobayashi, who participates in a new idol group project by Moonlight, is tasked with shooting the audition making footage. There, Kobayashi came to know the "real of idol business". (Source: natalie.mu, translated)

Source: AniList