He is Kumiko's old dog. He narrates the preview for the next episode. He is very loyal to Kumiko. He talks most of the time in the anime even though nobody can hear him (however Shin seems to be able to know what Fuji is thinking) (

Source: Wikipedia)

Kumiko "Yankumi" Yamaguchi enters Shirokin High School to become a math teacher. She's assigned as the homeroom teacher for class 2-4, populated by a gang of delinquents.  At first, the class tries everything to rattle her cage, but to no avail. In a short period of time, Yankumi gains the respect of the class. But what the school doesn't know is that she's the heir to the Oedo Group, a powerful yakuzan clan. So while Yankumi struggles to excel in her career as a teacher, she must also keep her yakuza background a secret.<br>
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(Source: Media Blasters)


**Non anime roles:**
- Jark Shougun - Kamen Rider Black RX (TV Series)

[Website](http://www.jonavner.com)

Jon is one of the leading actors in interactive audience participation shows performing regularly with THE KILLING KOMPANY COMEDY MURDER DINNER SHOWS and in addition to his many films, televisions shows, commercials, radio and print, his voice is well known in animes and video games. 

Fresh out of college, Kumiko "Yankumi" Yamaguchi becomes a math teacher at an all-boys high school. Unfortunately for her, she's assigned by the school board as the homeroom teacher for class 3-D, which happens to be the class of delinquent students. When the class attempts to make a living hell out of Yankumi's career, they fail as her persistence and aggression gain her respect. However, little does anyone in the school know that Yankumi is actually heir to the Kuroda Ikka—one of Tokyo's most powerful yakuza clans.
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(Source: Anime News Network)

Note: Chapter count includes 9 extra chapters in Volumes 9-15

Fuji Kuroda