Terrifying Girls' High School Series in order

Terrifying Girls' High School (恐怖女子高校 Kyofu Joshi Koko) is a 4-film series of Pinky violence pink films made by Toei during 1972 and 1973. Reiko Ike was the star of all four films, and Miki Sugimoto co-starred in the first two. 4 films, 5h 41m in all, in release order.

Terrifying Girls' High School: Women's Violent Classroom
1972 · 79 min
Delinquent girl boss meets and conflicts with an orphan girl who lives an isolated life after the dramatic deaths of her parents. She plays the piano, but stands up against her lecherous guardian, who is also a school official.
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Terrifying Girls' High School: Lynch Law Classroom
1973 · 89 min
Three new students at a super-strict girl's school must face off with a repressive school administration, the sadistic, murderous student discipline brigade and corrupt politicians over the murder/suicide of one of their friends. They're approached by a blackmailer (Tsunehiko Watase) who promises to help them exact vengeance in exchange for setting up a corrupt local politician, and aided by a independent Yakuza biker chick (Reiko Ike).
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Terrifying Girls' High School: Delinquent Convulsion Group
1973 · 87 min
A nasty schoolgirl does what she pleases, under the protection of her father, who is the school principal. Another girl is not so nasty, but she is determined and tough enough to contest the girl's gang in a democratic vote - and win. That causes her trouble in school, just when her own father, who owns a truck transport company, is murdered in a fake car accident by an American mobster. Before the girl can react, her naive mother has signed over the company to the mobster, and accepted him as her lover. Repentant, the mother starts drinking, and the good schoolgirl ties up with a halfbreed young man, who also has a grudge against Americans. He starts spying on the gangsters, discovers they are dealing in drugs, but is killed before he can report it. The good girl will lead her team in a desperation assault on the mobsters - and the police will eventually arrive just in time for the showdown.
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Terrifying Girls' High School: Animal Classmates
1973 · 86 min
We find Reiko Ike once again cast as a tough schoolgirl who has to band together with her enemies to upset the reign of their private Catholic high school administration where institutionalized sexual abuse is endemic. The tables are turned on the principal and sanctimonious teachers as well as an American priest when the adult evildoers are publicly humiliated and exposed before the entire student body.
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Frequently asked questions

What order should I watch Terrifying Girls' High School Series in?

1. Terrifying Girls' High School: Women's Violent Classroom (1972), 2. Terrifying Girls' High School: Lynch Law Classroom (1973), 3. Terrifying Girls' High School: Delinquent Convulsion Group (1973), 4. Terrifying Girls' High School: Animal Classmates (1973).

How long does it take to watch all of Terrifying Girls' High School Series?

About 5h 41m across 4 released films.

Do any Terrifying Girls' High School Series films have post-credit scenes?

None are listed on TMDB.