The protagonist of this title. An indifferent student (in high school in the anime and in college in the game and manga), he has some talent as an artist and is persuaded to form the "Brother 2" dōjinshi partnership with Taishi.  -Wikipedia-

Destiny or delusion? It's a hilarious rollercoaster of laughter and confusion when Taishi, the ultimate otaku, drags his friend Kazuki into the swirling world of ambition, hatred, and love - the world of fan comics! Poor clueless Kazuki must sink or swim when he's dumped straight into the middle of a massive comic convention. Lost amidst hoards of buyers, sellers, and cosplayers, Kazuki is about to be baptized by fire, all in order to lead him toward his true calling: to take over the world through fan comics! 
Meanwhile, Kazuki's childhood friend Mizuki isn't about to let him be dragged from his normal life without a fight! But will she be able to stop the addictive draw of the new world that lies before Kazuki? Little by little, Kazuki is slipping down the path towards destiny - and Taishi is shoving him every step of the way! 
(Source: RightStuf)

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Samuel Brent Oscar Riegel is a voice actor, writer and director who appears in many television cartoons, anime, and video games. He began as a child actor in theater in Virginia, and moved to New York City to perform in Broadway and off-Broadway shows. In 1994, he graduated from the Professional Children's School on the Upper West Side of Manhattan, New York City. After graduating from the University of Virginia in Charlottesville, VA, he returned to New York to begin his voice acting career. He now resides in Los Angeles, CA.  

He is the older brother of [Eden Riegel ](https://anilist.co/staff/107937/Eden-Riegel) and the younger brother of Tatiana Riegel.  He was in New York City on September 11, 2001, and he recorded the attacks on the World Trade Center with his video camera.  He is best known for his role of Donatello from Teenage Mutant Ninja Turtles (2003 series).

Sendo Kazuki, failed the entrance exam for the art college he was applying to, His childhood friend, Kuhonbutsu Taishi forced Kazuki to enter the doujin (private publishing) world. 
(Source: AnimeNfo)

A college student, Send&#333; Kazuki, happened to set foot in the doujinshi community. There, people are producing and selling doujinshi, which is the comic book drawn by fans rather than professional writers. At first he was reluctant, but as he met the girls earnest about producing doujinshi, he was gradually involved in creating it himself. 
This series is based on a Dreamcast/PC game, "Comic Party", and its setting is different from the TV series. The main characters, Kazuki, Taishi, and Mizuki are college students whereas they were high school students in the TV series. The story starts after Kazuki has become acquainted with other characters. 
(Original description from AnimeNfo)

The plot centers on Kazuki Sendo, whose passion and talent for painting and drawing propels him into the world of doujinshi (underground comics). Soon, Kazuki's everyday life is consumed by the fanboy life and his girlfriend is beginning to have some serious doubts about him... Sure, his new career as a struggling artist has begun, but at what cost to his friends and family? (Source: Tokyopop)

The DVD Specials. 
Kazuki, together with his friends, goes to a Comic Party that's going to be held in a hot spring. There, they make an incredible discovery that is going to reveal something amazing about comic conventions.

Kazuki Sendou