Gokusen Kanketsuhen is a collection special Gokusen chapters. 
1. Gokusen (ごくせん2008); You 2008 #2 
Kumiko has trouble with her new class of first years. 
2-4. Gokusen Kanketsu-hen (ごくせん完結編); You 2009 #4-16 
Kumiko and Shin's relationship hasn't gone very far. Shin gets kidnapped by a daughter of another yakuza group with intrusions of making him her bride-groom. Shin's father informs Kumiko that although he respects her as a teacher, he does not want her to see Shin again. Then it only gets worse when the other former Shirokin try to rescue him before Kumiko gets there. 
5. Gokusen Bangai-hen: Ucchi & Shiori Kyoufu no Ippaku Ryokou!! (ごくせん番外編 うっちー＆詩織 恐怖の一泊旅行!!); You 2007 #15 
Chapter focusing on Ucchi and his girlfriend. 
6. Gokusen Bangai-hen: Hontou ni Attara Kowai Hanashi Gekijou (ごくせん番外編 本当にあったら怖い話劇場); Bessatsu You 2007-11-20 
Assortment of short stories with a horror theme.

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.
 
(Source: Anime News Network)

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

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