箱庭モンスター ～少女漫画家、ときどき紙袋～

The workplace comedy manga centers on a manga creator who worked in an exploitative shounen manga magazine that had tight deadlines and bad working conditions. Once he quits and joins a shoujo manga magazine, despite never having read a shoujo manga himself, he is expecting a literal heaven, but gets something more than he bargained for. (Source: Anime News Network)