From Tokyopop: Before Ekichi Onizuka would become "Great Teacher Onizuka". He and Ryuji Danma were the leaders of the famous biker gang, Oni Baku. When they weren't out riding around and getting into trouble, this duo could be found in school. Doing what you ask? Picking up young women of course! You may also like: + Inu Yashiki + Kingdom
From Fantasyshrine: Okano-sensei, a high school teacher, was sexually molested by a pervert in the train on the way to school. As fate would have it, his student, Tokiwa, witnessed the whole incident. He then threatened to expose Okano for having a fetish of being groped by a man unless Okano agreed to be Tokiwa’s sex slave! In shame, Okano succumbed to the pleasure only Tokiwa could provide…
Ryuuko Matoi is a girl who travels with a single red scissor blade, searching for the wielder of the other blade who killed her father. She arrives at Honouji Academy, a high school that lives in fear. It is ruled over by the fearsome student council, led by the student council president, Satsuki Kiryuuin, who use powerful uniforms to crush anyone in their path. After suffering a crushing defeat at the hands of Satsuki, Ryuuko comes accross a possessed school uniform named Senketsu, who puts himself on Ryuuko, granting her special abilities. Teaming up with Senketsu, Ryuuko stands up against Satsuki and the student council to liberate Honnouji Academy from their iron grip and find out the truth behind her father's murder. Source: Wikipedia + Monster Manga
A cute high school girl comes to a new school. And when she arrived, she finds out that all the girls in this school are in love with each other.
Full remake of the original Getter Robo series.
Aizawa was bullied by Suzuki to the point of becoming truant. He picks himself back up and becomes a teacher. 20 years later, his bully's daughter is one of his students and she's being harassed in class, a secret she keeps from her father.
From Twisted Curiosity: Meguru is an ordinary schoolgirl on a school trip. They stop to take a break and she is determined to confess her feelings to the boy she likes, Yashiro. When they get back on the bus, however, a strange man grabs her and says that he’s bus-jacking them. He shoots Meguru for putting up a fight and she thinks, fading into oblivion, “I wish I could go back in time”. The next thing she knows, she has woken up in her bed at home and quickly finds out that it’s the day before! What in the world?
She had gone from the Princess to Cinderella in a single night. She had no choice but to step on the arduous journey to seek help from her "fiancé". How could she have imagine that not only would she be rejected for help, she didn't even meet him. What's more, she accidently met her fiancé's uncle and fell into a forbidden love all of a sudden?!
Short tales about a girl in a bad mood, and a boy who's nice to her.
Follow the lives of five senior art students as they learn color theory and technique…and have some cute and colorful life lessons along the way.
Two guys: cousins, both left-handed, both passionate about becoming their school team's best pitcher. One of them has already lost the spot once, back in elementary school; and his cousin moved away not long after, seemingly clueless to the fact that he was leaving the guy who introduced him to baseball dispirited and defeated. But now Yoshizawa Sora is back, still smiling innocently while encouraging Yoshizawa Shuuji to get back into the game. Shuuji accepts, determined to defeat the guy who, in his eyes, took away the only thing that mattered to him.