It's 1925. Baron Midorikawa has a difficult mare named Basilis, and the only one who is able to ride it is Momiji, a stable girl. Baron Midorikawa has a nephew, Awa, whom he hates and uses only as a business tool. Somehow, Momiji and Awa fall in love, but Momiji dies soon after. Now in 1977 Tokyo, everyone has been reincarnated and will meet again.... From Shoujo Manga Maniac: Japan, 1920: Momiji is the only person who can ride the Baron Midorkawa's unruly horse, Basilis. A romance blossoms between Momiji and Awa, the baron's nephew, but that romance ends in tragedy. Seventy years later, they will be reborn and will meet again...

Morohoshi Daijirou's take on the Grimm Fairy Tales. Some are relatively straight adaptations while others have a sci-fi, horror, comedy, or mystery-twist.

From Lililicious: A sci-fi story set in a future where men have died off. Women have been divided into two groups: Adams and Eves. Each has a set role in society. The protagonist, an Adam, has just entered Kingdom Academy. Romantic relationships between Adams are forbidden there, so I'm sure you can all guess where this is going...

From Evil Flowers: Although this was released after the 12 volumes of Masca, it is a prequel to the main story. It shows how Caien became a demon lord, about his relationship with Rakin, The King of Speira, and the love triangle between the 2 with the beautiful Rea of the mascan race. Asarella also apears, but the story seems to be concentrating more on Rakin and Rea.

Updating

Each year, the villagers of a certain mountain village hold a festival to celebrate the harvest. Tominaga Yuuki, a 17-year-old born outside the village, is chosen to play the role of purifier in the Oni exorcism, the festival's most important ritual, opposite 3-year veteran of the dance Kurashina Hana, his female classmate. In the days leading up to the festival, Yuuki gets more and more fru strated with his role, until he starts to see...?

Updating

Ryosuke returns back to his birthplace to help run his family's vineyard after his father gets hospitalized. He has sour memories of his hometown after being shut down by the girl next door, who he admired from day one. That's the whole reason why he's never returned after moving to Tokyo, to attend College, 3 years ago. Despite his reluctant return, Ryosuke happens to be quite popular with the ladies. His sexual endeavors start off with a fling with a former high school classmate, a charming girl working at his parent's vineyard, and a sexy nurse. He even manages to allure the girl next door who he has been dreaming of his whole life but...

Travelling salespeople visit a small, remote town. However, neither the town, it's inhabitants, nor the salespeople are what anybody would consider "normal". A supernatural crackpot comedy.

A oneshot that appeared in Comic Flapper 2015-02.

Minori is the manager of her high school's baseball club, which has been defunct up until five years ago. Even now, it's a little rough, since there currently are no seniors in the club at all! None of the second year players know why the club closed so many years ago, or about the baseball history all their fathers share...

From Reverein Scanlations: A series of short stories featuring two characters with the same name, Asuka Koji and Takaki Asuka. They both have super powers and share a common love: SAKE! This really has no real plot but it provides a lot of entertainment and random characters from her other works also appear.

From Garo 1982-07.

From Ryuusei no Mafia: Minnie’s the only human living on an alien planet and because of that she’s rejected by almost all the other inhabitants. Then one day something falls outside of her house and it happens to be... a human prince?!

The protagonist is your average, everyday, Korean school student. That is, if not for his obsession that aliens live on Earth disguised as humans. Much to his surprise, he was right, the aliens play a game called "Avatar" where they take human form and live human lives. And because of a glitch he caused in their system, now his very life could be at risk. Now he needs the protection of an Admin of the "Avatar game" or else he could very well die!

From Wikipedia: The story is about Kozue Ayuhara, the new girl who transferred to Fujimi College, who tried out for the school volleyball team. Her friendship with Midori would develop, and her talents would impress coach Honga more and more each day. Though she showcased extraordinary volleyball skills, she would make enemies with Yoshimura, the star of the current team. Kozue would discover that being at the top would bring stress, incompatibilities and other dilemmas into her life. Her high expectations of becoming the best volleyball player in the school, Japan and eventually the world, would set the tone for the drama to follow.

From Beautiful Soup: "B Grade" is a manga that takes place a few years after the two lead males have graduated from high school. One of them came out in high school, and the other was a scary sempai who kind of took care of him. But now they meet at the same office, several years later, where the kouhai has yet to come out of the closet...

High schoolers Rin and Kyo are childhood friends from kindergarten. They're so close that there's virtually nothing they don't know about each other. Rin, who had been pining for Takahashi-kun, his father's lover, for many years, finally gave up and wished for his father and Takahashi's happiness. After his broken heart was comforted by Kyo, Rin was finally able to stand up again, but then suddenly, he was confessed to by Kyo...?!

From batoto.net Fujii Kana just broke up with her boyfriend, when her older sister Mizuho calls her to ask for her hospitality for her and... her girlfriend. How will Kana, who hadn't ever imagined her sister to be a lesbian, cope with this cohabitation?

Hojo wins three wishes from a ticket and makes some choices that affect his senpai in odd ways...

Takaya and Yurina are back in this sequel to dive into their history. Back in kindergarten, Takaya had made fun of Yurina, and now that she's forgiven him in the present, what other things from the past will come to haunt her? Will they be able to resolve all their problems and go back to their peaceful lives...?!

Vampires exist. It is the duty of Hellsing, an organization sponsored by the British government, to hide that frightening fact and protect the blissfully unaware populace. Along with its own personal army, Hellsing also has a few secret weapons. Alucard, an incredibly powerful vampire, has been controlled by Hellsing for years. Although he dislikes being a servant to the Hellsing family, he certainly enjoys his job as Hellsing’s vampire exterminator. Seras is a fledgling vampire and a former police woman. Although reluctant to embrace her new self, she is still a valuable member of the organization. Integra Hellsing, the current leader, is usually fully capable of fulfilling her duty, but lately, vampire activity has been on the rise. Unfortunately, the cause is more alarming than anything she could have imagined. A group long thought dead has been plotting in secret since their apparent destruction over 50 years ago. Plotting to plunge England, and perhaps the entire world, into war.

Set in the Daiouyama Prefecture High School, a school with over 3000 students. The Student Council Empress decides that small clubs are a blight on the schools resources, and that they should be forcibly merged into one club. Which of course throws four very different clubs and girls with different interests into the same room…

A short prequel to Shounan Jun'ai Gumi and pre-prequel to GTO about how Onizuka Eikichi and Danma Ryuuji meet. Pantyshots and gratuitous asskicking galore. This manga was added as an add-in to Shounan Jun'ai Gumi and later rereleased separately. Some time later GTO came out and the two prequels became more famous.