One of Mashiro's schoolmates. In the wake of finding Mashiro's ability in drawing, he suggested that they attempt to distribute a manga together. Despite the fact that Mashiro initially won't, the two start to cooperate after he takes Mashiro to Azuki's home and Azuki and Mashiro choose to get hitched after their fantasies work out as expected. He in the long run dates Azuki's closest companion Kaya Miyoshi. Takagi is an author and composes the storylines for the pair's manga.
The two began working under the pseudonym Ashirogi Muto in spite of the fact that he is frequently called Shūjin. Takagi represents considerable authority in strange story lines. When he came up against a temporarily uncooperative mind after they chose to do a muffle manga, he began to trading thoughts with Yuriko Aoki who required help with her manga. He worked with Mashiro on manga, Detective Trap which was crossed out. He and Mashiro have proceeded onward to chipping away at a muffle manga, Run, Daihatsu Tanto! which started things out in Akamaru Jump. He as of late proposed to Miyoshi so as to clear up a false impression.