Steins;Gate: The Committee of Antimatter

Steins;Gate: The Committee of Antimatter was a planned light novel that was set to take place in the future of the Steins Gate worldline. The story was to be written by Chōshirō Miwa, with original scenario plans by Chiyomaru Shikura, and illustrations by Tadasu Yoshida based on the original character designs by huke. The light novel was expected to release on January 16, 2015. However, on December 22, 2014, it was announced that the light novel had been officially canceled.

Synopsis
The novel was to take place in Akihabara on the Steins Gate worldline in 2016—six years after the main story.

After graduating university, Okabe industrializes the "Future Gadget Laboratory," but in fact, Daru is the one earning all the income, while Okabe earns his living accepting detective-like requests. One day, the building owner's daughter Nae asks Okabe to investigate her father, who she says is acting strange. Okabe remembers his experiences on other worldlines, and is worried. However, before he can think any further, he encounters Suzuha, a girl who should not exist on the Steins Gate worldline yet.

Characters

 * Rintaro Okabe: Years after the events of Steins;Gate, Okabe turned the Future Gadget Laboratory into a business and named himself Company President after graduating from university. However, with Daru being the one making the most money from the lab, Okabe has begun to pursue odd jobs and detective work to get by. 24 years old.
 * Mayuri Shiina: She is Okabe's childhood friend, and a calm and soothing girl with a carefree air about her. At the time of the novel, Mayuri is a kindergarten teacher. She helps manage the finances of the lab and takes care of employee welfare (i.e. making dinner for Okabe). She happily watches over Okabe and Kurisu's long distance relationship, but she sometimes has stern words regarding it. 22 years old.
 * Itaru Hashida: An employee at the Future Gadget Laboratory and a close friend of Okabe. He helped Okabe turn the lab into a business after graduating from university. Daru creates smartphone applications, PC software, and web security programs, essentially supporting the entire company on his own. His loyalties to the 2D world were altered after he met a beautiful cosplayer, Yuki Amane, at Comima. 24 years old.
 * Kurisu Makise: After graduating from Viktor Chondria University, she joined its neuroscience research team. She has been on good terms with the members of the lab members ever since she met them in 2010, and though she lives in America, she pays them visits whenever she is in Japan. She and Okabe maintain a long-distance relationship, but it has seen few developments and has mostly stagnated. 24 years old.
 * Suzuha Amane: A cheerful, energetic, and strange girl that works as a part-timer at the Braun Tube Workshop, located below the lab. Given the events of Steins;Gate, she should not be present in her current state in 2016... 18 years old (unconfirmed).
 * Nae Tennouji: Daughter of Yugo Tennouji, the owner of the Braun Tube Workshop. She is generally shy and reserved, but occasionally, she goes haywire... earning her the nickname "Flat-Out Princess." Something is going on with her father, and stricken with suspicion and worry, Nae enlists in Okabe's help. 17 years old.
 * Moeka Kiryu: Writer at an editorial company called "Arc Rewrite." She occasionally works at the Braun Tube Workshop, which is where she met Nae and Okabe. She has poor communication skills, and as a result, she relies on her smartphone a great deal. However, her part-time job at the Braun Tube Workshop and her interactions with the lab members have slightly improved her condition. 26 years old.
 * Faris NyanNyan: The most popular maid at the longstanding maid café "MayQueen NyanNyan," as well as a major landowner in Akihabara. She is a close friend of Mayuri, a former employee at the café. She helped a great deal with the industrialization of the lab by mediating jobs for the members, making her Okabe and Daru's greatest benefactor. 23 years old.
 * Luka Urushibara: Son of the Yanabayashi Shrine chief. Though he may appear to be a woman at first glance, he is now a fully-fledged man. He became a friend of Mayuri's in high school, and as a result, he became a lab member. Though he attends university now, he still works as a shrine maiden, attracting quite a few visitors with his fair body. 22 years old.
 * Rimi Sakihata (Chaos;Head) and Sawada Toshiyuki (Robotics;Notes) were likely set to make appearances in the light novel based on Tweets posted by the official Science Adventure series Twitter account and the novel's illustrator.