If you're looking for anime similar to Mangirl!, you might like these titles. All recommendations are made by Anime-Planet users like you!
Moritaka Mashiro feels as if life is passing him by; with no dreams or motivation, he trudges through day-to-day life. One day, after leaving his notebook behind, he returns to school and finds the smartest guy in class, Takagi, waiting for him. Takagi is happy to return the book, but on the condition that Mashiro agrees to become a mangaka with him. Though Mashiro initially declines, he soon reconsiders when he discovers that the girl he likes, Azuki, dreams of becoming a voice actress. And after promising that she can have the lead role if their manga is ever adapted into an anime, he suggests that they get married once they are both successful! Shockingly, she agrees to the proposal and Mashiro and Takagi embark on their quest to become manga artists.
The anime have similar subjects. However Bakuman is deeper and goes on the mangaka side of things rather than the editors. It however is no way near as MOE as mangirl! So if you're expecting MOE look the other way as there is barely anything in Bakuman that fits MOE.
Ditzy Nana, fujoshi Chiwa, idol wannabe Kaeru, and goth groupie Kai are single salarywomen in their upper 20s, but just because the friends have jobs to juggle doesn’t mean they can’t also have fun! By spending their weekends and free time going on awkward group dates, imagining ridiculous yaoi scenarios, and flirting with ultra-buff bodybuilders, the women are sure to have a great time and create plenty of memories in the process!
Another comedy with super-short episodes about a group of working women. Mangirl! focuses more on their work, and Turning Girls on the personality quirks of the women themselves (and is far more strange and less spastic), but they gave me a similar vibe.