Doujin Market. It is a place where individuals sell their self-published books. Each participant works daily to achieve their personal goals.

While their are some who obtain their dreams, there are also those who get pounded by reality. This is the story of those who live in the world of Doujin.

Mukai Naoya has loved Saki Saki since grade school, and when she finally accepts his feelings, he's at his happiest. But one day, a cute girl named Minase Nagisa confesses to him! Not wishing to choose only one over another, Naoya chooses to go out with both of them!! What will be of this love triangle that challenges morality itself?

(Source: Mangadex)

Its starts from where the last season ends, Aito and Ashisu meets her new assistant. An entry of a new member. what story can she make out of Aito and Ashisu's life?
(Source: MU)

A story about an mangaka, his assistant and the editor
From mangaupdates:
A Life Description about the Mangaka Aito Yuuki and his Assistant Ashisu Sahoto. Aito-san doesn't understand the feelings of the characters on his stories. So he asks Ashisu to help him. Ashisu would do everything for the work, she would even let him touch her breast so he will know how it feels like!The Habit?! The Pervert?! Can we understand them? That's the Comedy of a Mangaka Life.

A super-short oneshot from the creator of Aho Girl, and Mangaka-san to Assistant-san.

At the young age of 18, Erai Tenka is the president of a highly successful IT company and is filthy rich. He has everything he wants, except for one thing: a girlfriend. The truth is, he is desperately shy around women. He is attempting to get over his shyness by hanging out with a team of bunny-girls, but it hasn't seemed to help.
One night, Tenka goes out walking alone and is very nearly mugged. Luckily, a girl shows up and rescues him, and Tenka falls in love with her at first sight. It turns out that she's a student at his little sister Yuika's high school, so Tenka enrolls immediately. Unfortunately, his crush, Himuro Sai, thinks he's a creepy, perverted stalker, and he's too flustered around her to explain himself! He'll have to get over his shyness if he wants to have a chance to win Sai's heart!
(Source: MangaHelpers)