Description:

Kusanagi Kei, a high-school student living with his aunt and uncle, has an encounter with a female alien. This alien is revealed to be a new teacher at his school. Later, he is forced to marry this alien to preserve her secrets. From there, various romantically-inclined problems crop up repeatedly. (Source: ANN) Note: The title was never "- sensei," the Japanese characters phonetically spell "teacher"

Description:

Onodera Kensaku, a self taught martial artist, undefeated street fighter gets his ass whipped by a girl. Not by just any girl, but his home room teacher Asato Nanae and her High Left Kick. You'll see brilliant pictures of high quality in shading and facial expressions, with a twist of pervertal activities and one liners that will have your sides spilitting as you follow in the wake of Onodera's adventures to defeat Asato. (Source: mangaupdates)

Description:

Ogawa Maho is a young, fresh teacher who just arrived in Tokyo to take on a new teaching position at a high school there. Things don’t go as she planned, however, when she breaks up with her boyfriend whom she had been dating for 6 years. Distraught over her breakup, Maho has a one-night stand with a guy she meets on the street. The encounter was memorable and manages to cheer Maho up enough that she can face her new job and move on with her life. Of course she is shocked when she discovers that the random guy she spent the night with happens to be one of the students in her new class! (Source: shoujo-manga)

Description:

Twenty-four-year-old Kirara is on her way to her wedding when she is killed in a car accident. However her love for her fiancé is so strong that she is permitted to return to earth as a ghost to see him. But she is sent back 8 years in time, to when she and her fiancé first met. However her own meddling in the past may make her 16 year-old-self turn away from her would-be fiancé.

Description:

From KodanClub: Akira Shindo has been transferred to Fuga High School where she is almost raped by a group of young thugs. She meets Mahiru Suruga, a mysterious but beautiful girl with both arms in bandages. Mahiru is aloof and cold. Her motto is, "I will neither rely on others nor have anything to do with others." The two girls get caught up in a series of incidents at school and Mahiru, a strong fighter, always manages to sort them out. Mahiru starts to soften up, as she becomes friends with Akira, who loves to stick her nose into other people's business. Mahiru's school life is turned upside-down as many people approach her. Kaede is a high school student training as a swordmaster under a senile old man, who turns out to be a real pervert and a fake. Mahiru's father also comes into the story and things get chaotic. One day, Satoru Tsunami, a high school student and an aspiring reporter starts following Mahiru. He deeply respects Mahiru and considers her the strongest high school student and a rebel against adults. Why is Mahiru so strong? Satoru tries to find out her secret. Why has Mahiru shut herself out? What is going on inside Mahiru's mind? WARNING: Scenes with semi-nude gals (Source: MU)