From Blissful Sin:

1-2) Scarlet
College student Akio is dating his beautiful classmate, Ryou. Unable to stand the slightest loneliness, Ryou accepts any girl who approaches him. One day, Ryou introduces Akio to a girl he is thinking of marrying which makes Akio decide to completely break it off with Ryou. Instead, a heart wrenching love story takes stage!

3-4) One Night Stand
During the day Harumi is just a normal businessman but when night comes he changes into a different person.

5) My Lover
Keito wonders why he is still in a relationship with the overly depressive Naoki

Midori is a high-school-aged lesbian who has just been rejected, driving away one of her few friends. In the world right now, there are creatures called "Extraneous" that appear out of nowhere, kill people, and disappear again. No one remembers when they started appearing, but the chance of being killed by one is about the same as the chance of dying in a car accident. Midori's mother was killed by one a year ago, and not only is her father rarely around, he's also deeply in debt. She gets attacked by an Extraneous on her way home, but is saved by a mysterious girl who claims that she's a god. Midori names her Hitsuji (sheep) because of her horns, and takes the girl in. They start a website, Hitsujiya, an Extraneous-fighting service provided by Hitsuji.

Hang Hui falls into confusion when his childhood friend, Wang Ying Juan, dies. An old man, An Dong Wei, finds Hang Hui and leads him to the River Gate. The River Gate is where the spiritual and material worlds join; the Gate of Life and Death for humans.

From TCMANGA:

Just like an ordinary girl, Momoka enjoys her boyfriend's company, eating breakfast together, dating, etc. The only difference is her boyfriend, Hiro, is an upcoming actor in the entertainment industry. Therefore their love life has to be kept in secret. But Hiro's manager wants them to break up in order to not taint Hiro's popularity...

Also includes 2 extra stories.

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.

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) ?

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

Meet Suzuki Mika, teacher at Okitsu High School. Mika-sensei is a good teacher, but she has a small problem... literally. Although she's 27, she is only 148 cm tall, and has the face of a child. As a result, it is often difficult for Mika-sensei to get anyone to take her seriously.

From Fantasyshrine:

"There's no way you can run away from me-- I MUST HAVE YOU!" said the super-egotistic ex-host Hisakawa as he carried a bouquet of roses, to the beautiful yet uptight sensei, Shindo Misaki!!

Under the masterful fingers of his pursuer, Misaki was assaulted by a powerful lust, which rendered him defenseless to Hisakawa's advances. Though in truth, it was Misaki's unconscious wanton responses that captured Hisakawa's heart!

1. Sensei no Jijou (The Cause of my Teacher)
Tooru, who is fond of glasses, confesses his tender feelings to his teacher. The teacher accepts him, but everytime they kiss the teacher takes his glasses off. Does he not want to see Tooru's face when they kiss?

2. Shidoujitsu nite (In the Guidance Room)
Souma Kazunari is a student that is regarded as strange by fellow students. He is in love with his male homeroom teacher Fukuzawa Hajime. Some students bully Souma by hiding a porn video in his desk, and it is found by the teacher. Fukuzawa calls Souma to the guidance room to give him a lecture...

3. Torawarebito, Hitori (A Person Held Captive)
Iijima and Ichikawa are childhood friends; Iijima has been in love with Ichikawa since they were small. He has chased after Ichikawa all his life, and has now entered the same company as him. After a drinking party where their supervisor has been hitting at Ichikawa, Iijima finally looses his cool and ties Ichikawa up...

4. Wakage no Itari (Youthful Indiscretion) — Sequel to Shinobu Kokoro wa.
The ninja Hiiraki refuses to follow his captain's orders to go on a mission separated from his lover Asagi and is thrown into jail. Will Hiiraki's and Asagi's relationship survive this?

5. Wakasama, Gomen! (I'm Sorry, Young Master!)
The son of a lord, who feels that Kurenai, his guard and martial arts teacher, took a sexual joke too far, challenges him to a match.

6. Umi no Miya no Ko (Child of the Palace in the Sea)
A scholar teacher of the Mountain palace country escorts back a spy boy of the Sea palace country (which dominates the Mountain palace country) who is bullied.

Sensei no Jijou (The Cause of my Teacher) extra.

Nonomura Heita, a high-schooler, takes care of the last boarder left at his grandfather's house after his grandmother passed away. The boarder is a translator named Miharu, who insists that Heita make a bentou for him every day. Should such a wifely duty be given to a high school boy? Or will the duties someday go beyond just making bentou?

Lovely manga anthology on love and sex, plus a bit of humor for female readers. This book features all the stories of female characters falling love with her senior students. Includes 6 works from 6 authors: 1) "Zakuro no Mi wo Abaite" (Opening Pomegranate Fruit) / Mayu Shinjo : Prideful Kotoko is greatly admired at her school, but will that change when ruthless Takahiro backed by a powerful family sets his eyes on her? 2) "Sexy Shiyouyo!" (Let's Do Sexy!) / Yuuka Kousaka 3) "Jun-ai Egoist" (Pure Love Egoist) / Mio Ayukawa 4) "Netsu-ai Byoutou" (Love Fever Hospital Ward) Yuka Murata 5) "Wagamama na Kuchibiru" (Selfish Lips) / Haruko Kurumatani : Yuu gets a job acting in a commercial with popular idol star Kano Itsuki. When Yuu works up her courage to introduce herself, he kisses her! What does she do but punch him. 6) "Double Face -Akogare no Senpai Hen-" (Double Face -Senior Student Version-" ) / Kai Uchuuda

A military test accidentally sends a modern-day army back in time to feudal Japan. When their actions in the past begin to have an effect on the present, another unit is dispatched to retrieve them. But the commander of the lost unit has other plans. He intends to use his advanced technology to conquer Japan and change his country's destiny. -- {Summary by Mangaupdates.com}

The manga is about the Sengoku Jidai (Warring States Period) of Feudal Japan. The rulers of the land - Daimyo - and their servants - Samurai - fight to get the rule of all Japan. Especially, the most powerful ones are the Devil King Oda Nobunaga of Owari, the Tiger of Kai Takeda Shingen, the Dragon of Echigo Uesugi Kenshin, the Hojos of Odawara Castle

From MangaHelpers:
Sawamura Soushi is a soldier in a war-torn future. He meets a cute, innocent young girl named Nadeko, with whom he starts up a friendship. Nadeko is a flower girl, one of the girls who has a flower growing from her heart. One day, when Sawamura is trying to protect her from danger, she confesses her love to him and protects him with the plant growth that suddenly comes forth from her body.
Sawamura soon learns that there is a special squad of flower girls and their partners, and that their abilities are awakened when they fall in love. But does he really love a girl that is a decade his junior, and will he be willing to be a good partner for her? What's more, he learns that the awakening also starts the growing of the flowers in their bodies, so that the flower girl soldiers have only a short while longer to live. How can Sawamura and Nadeko make the best of such a terrible situation?

A manga based on the Sengoku Basara 3 action video game. The main characters, Date Masamune and Sanada Yukimura are two warlords who are both attempting to conquer all of the land. Almost greater than their desire to conquer, though, is their desire to fight each other in single combat.

From Bliss:

With the death of Nobunaga, Japan is thrown into a mist of battle once again as the many warlords of the nation try to unite it as one. But can any succeed when faced against Nobunaga's sucessor, Toyotomi and his lust for power thats sets the flame for war as he try to take over the world fulfilling his ambitions of absolute power?

In Hell, Tobe has been tortured for 300 years now, and his spirited desire to be free doesn't show any signs of fading. Tobe is given a final chance to make up for all the sins he committed while alive on Earth: he must use the legendary sword, Togari, to defeat and destroy 108 Sins in 108 days.

So Tobe is sent to modern-day Japan, and even though things aren't exactly like the Japan he remembers, he must defeat the 108 Sins in time to be free again.

From In the Water:

Biri Kobouku's gaze always happens upon a figure. For some reason, she can always identify him, even though she's never seen his face. Can someone fall in love with another when they've only seen them from behind?

• Shounen
Miyaji is suddenly approached by Hayama, her senpai, who tells her "Inside me lives a boy, and he's fallen in love with you."

• Wicca