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Misuzu Hara is a 24-year-old high school teacher who, four years earlier, endured a traumatic experience at the hands of Hayafuji, the then-boyfriend of her best friend Minako. She has never forgotten the experience, but she has kept it secret from Minako to protect their engagement, and has rationalized it to herself as having occurred to her due to her being a woman, even if it has continued to negatively impact her emotional well-being

God has been dead for some time, and the angels in heaven have decided it is time to find a replacement. Though very reluctant, the angel Rain has been chosen as one of the four candidates in for consideration to become the next god. He and the four other candidates will decend to earth for one year so that they may perform a test to determine their suitability for the position, with the ability to reveal their true identity to one human being of earth. Thus, Natsume Shirou, a very normal high schooler with dreams of becoming a teacher, is chosen by the angel Rain to be the help. As for the test, Rain and Shirou must raise a 'baby', with no thoughts or emotions of its own, into a creature as close to a human as possible

Alice's parent were killed when she was young, she saw the killer and made the promise to herself to kill him. Little did she know that when she will go to high school, the killer would become her teacher.

1-2) Sensei to Himitsu
Kaji's woken up from his nap hearing popular Tsunoda-sensei getting hot and heavy with another guy! But it's his partner, the plain Aritou-sensei that Kaji can't stop thinking about. Kaji's eyes are being opened as he finds that the needs and dark desires that can bind together lovers aren't always about love...

3-6) Hold me for all of Time
A researcher, Sawatari Kaoru, runs off after finding out that there will be no more funding for his research. As he wanders around he sees an abandoned warehouse where he could use to continue his research with his remaining savings. As he walks inside the building, he meets an arrogant little boy. Surprise ensues as to the boys identity, and the unexpected result of his own research...

Extra) And then...
Continuation of ch.1-2, a little into their future.

From : TCManga/Transient Mirage

At a "welcoming dinner," Umino and her former high school teacher re-united. It was because of him that she decided to become a teacher and eventually enter a relationship with him. However, what was supposed to be a beautiful relationship for Umino ended abruptly when he said "I fell in love with somebody else."

What will happen to Umino after her failed relationship?

They are cool! They are hot! They are irresistible!
No girl will refuse to share her bed with these Sensei.

1 & 2: Baby, Baby ー A Narcissistic Scriptwriter by Takahashi Yuu (高橋ゆう)
While enjoying a meal with her friends at a restaurant, Miyako expresses her dislike for the famous & handsome scriptwriter Yuuji and calls him a narcissist. Yuuji overhears her and gets really pissed off. Later he encounters Miyako as an employee of the publishing company he has recently signed a contract with.....

3: Higurashi Naku Yuugure Ni ー An Intellectual Librarian by Saionji Michiru
Touno Sensei's wife passed away 3 years ago and since then he had locked up his heart. He wanted to lead the rest of his life in the memories of his wife and so he left his teaching job and diligently started to take care of the library his wife left him. Nene who was once Touno-sensei's student is now a regular at his library. Nene has a hidden dark past due to which she has grown averse to love. Can these two scarred souls find solace in each other?

4: Love & Peach ー A Perverted Doctor by Ashika Nozomu
Izumi is suffering from haemorrhoids. She visits the hospital for treatment but slaps the proctologist Dr. Shuu since she mistakes him to be sexually harassing her. Coincidentally, that evening, Shuu and Izumi meet at karaoke on a group date and things start to get interesting...

5. Sweet Teacher ー A Confident Trainee-Teacher by Earithen
Kiori is currently working as a trainee teacher to obtain a teacher's license without which she won't be able to graduate from the Department of Education. But the problem is that she doesn't really aim to be a teacher and so she slacks off in her duties. Her perverted supervisor offers to help her get all the required credits in return for sexual favours. Helpless Kiori yields to his demands. Can the good-hearted Kazama-kun, another trainee teacher, save Kiori from being taken advantage of?

6. Ai Wo Hore! ー A Cute Homeroom Teacher by Koishikawa Funi
After being betrayed by her first love, Futaba believes that she can't fall in love ever again. She feels herself buried under a huge pile of snow because of the unexpressed feelings that have been accumulating in her heart. Can the cute child-like Horishi-sensei, her new homeroom teacher, melt her frozen heart (and body) ?

From Manga Abyss:

Yoshino Haruka, 16-years-old, substitutes for her sister at an arranged meeting and ends up falling in love with Kunihiro-san... To discover the day after that he is her new home room teacher! How are the two of them going to deal with this forbidden relationship?

1. Sensei to, Uwakichuu
Hana is in extreme shock over the fact that her boyfriend cheated on her. When confiding in the Kudou Sensei from the school infirmary, he plays with her hair… Are you trying to comfort me? When she was trying to leave, he asks an impossible proposition "Would you like to have an affair with me?"!?

Hana who became limp from those words was asked "Are you anemic?" I’m not! He says we should just have an affair to kill time, but Hana doesn’t understand him!!
- Chibi Manga

2. Ouji na Geboku no Aishikata
Juri has always admired Makoto-senpai as a 'cool beauty'. One day, she accidentally overhears senpai's girlfriend breaking up with him which then she realizes, senpai is actually an M?! Even though shes caught by Makoto-senpai, Juri is so heartbroken over her now shattered image of senpai, Juri slaps him then runs away. But the next day, senpai...?!
- Intercross

3. Shitsuren, nochi Bon'nou
Ume's boyfriend suddenly breaks up with her and in an atempt to forget him Ume wants to become a monk. But at the temple that somehow ends up being the home of her ex she meets her ex's little brother Kojiro ...

4. Tenshi ni Kiotsukero!
When Mana introduces her new boyfriend to her childhood friend, Shion, he changes from the sweet angel she's always known into a little devil!?
- Intercross

5. Chokotto Mirai de Machiawase

6. Sensei to, Uwakichuu ~Extra~

From Midnight Scans:

Sensei, the person whom I long for, whom I wait for, whom I love, and whom I want to be with. At night, I always think about you, Sensei. You are similar to me, but you have a completely different personality. The moment I fell in love with him, school has become a different kind of place because of him. The love between me and Sensei has begun to grow.

Includes the oneshot, Fake Letter.

The secret only between the two of us...

The handsome yet cool Hidou-sensei and the loner honor student with no friends, Renko. Actually, these two are secretly married! However, this marriage is a lie due to some circumstances!?

From Exiled Rebels Scans:

Yura, who picks up his nephew on the way home from work, has a natural enemy: The blunt and unsociable preschool teacher Kaji. Despite his kindness for the children he teaches, Kaji hasn’t a smile to spare for the guardians who come pick them up. Overlooked by the gay Yura, whom has a heart breaking history with his past boyfriend. When Yura’s unrequited love silences him, calling him a “bastard homosexual” Kaji steps in to protect him, pretending to be his boyfriend?!

The love between an unsociable preschool teacher x salary man

Yunogi has no working experience, but after being tricked into thinking he got a normal job out of luck, it turns out it's not so normal after all. Yunogi has to act as horror writer Kirino Shuusuke's dummy (i.e., stand-in).

From CoyoMoose & Turtle Paradise:

Third-year high school student Tachibana Kyou's world is shaken when a green-horn nurse suddenly arrives at his exclusively male school - the doe-eyed, baby-faced, and irresistably adorable Hirota Natsu. Completely taken with the new faculty member, Kyou abandons his playboy lifestyle for her, having found true love for the first time... But what will fate have in store for these two, engaged in the taboo relationship between teacher and pupil...!?

Masaki Tsuji is a divorced high school teacher in his early 30s. Lately, he's been running into a groper on his train ride to work. At first, he thought it was a mistake, but once the hand reaches around the front, things start to escalate! Then a voice whispers, "You're cute, Mr. Tsuji." He can't stop thinking about the perpetrator all the way to school. When Sohta, a student who usually gets good grades, hands in a blank test sheet, Masaki calls him in for a talk. They meet after school, and once Sohta confirms that they're alone, he goes in for a kiss! Sohta whispers to a panicking Masaki out of the corner of his mouth, "Have you been getting groped on the train recently?" Sohta ties him up and starts playing with his body...! This is a secret school love story between a handsome student and his 30-something teacher!

From Chibi Manga:
The kind homeroom teacher, yoshino sensei, is actually has a black heart! sensei is quietly meddling in here and there of suzuki's school life who accidentally find about his secret. tsundere high school girl x wicked teacher, secret lovey dovey school life!

From Shoujo Crusade:
Otomi's piano teacher is a handsome, sexy, and amazing pianist. She is crazily in love with him, but he is happily married to a wife whom he loves a lot. Things aren't always as they seem though.

It's the story of a high-school girl, Hibiki, who falls in love with one of her teachers. The two start dating, but run into a lot of trouble. Hibiki's friends cover for her, and part of the story is also about them.

Also included is a story called Tomodachi Nante Iwanaide in volume one:

A short story about Kumiko's five-year unrequited love to Kanata. Kanata has always seen her as the girl who ate a beef bowl and a good friend. Will that finally change?

Sensei steals glances at me. I think it's cute because I want to make him mine.
A sweet high school love story.

From Exiled Rebels Scans:
Takamine finally got his dream job as a high school teacher with his crush , Natsume. Now the two of them will be together, not as teacher x student but as teacher x teacher from now on. But does Takamine have an ulterior motive for becoming a teacher?