This is an omegaverse where manbeasts and humans co-exist.

Manbeasts can only be born from an omega (Ω) human. Kai is a young Ω abandoned by his parents. He was picked up by Luard (α), the head of the Siegfried family, the most powerful manbeast clan in the country, to bear their children.

Up until then, he was treated as a nuisance by those around him, so he was drawn to Luard who treated him as a human being. Before he knew it, now he dreams of becoming a pair with Luard...

However, he learns that the Siegried family doesn't form pairs and goes through multiple omegas to leave more descendants...And the destiny of an omega in heat is to go with multiple manbeast partners as well...

From Esthétique:

Kosumo has a serious medical condition that has kept her in the hospital ever since she was a child. Since Kosumo's blood type is rare, it impossible to find a donor.
While Kosumo is on the verge of death, out in the city, the 99th Generation Miko, Himiko-sama, gets into a terrible accident while trying to save a child. She is rushed to the hospital, and there her fate crosses with Kosumo's.
When the hospital discovers that Himiko has the same rare blood type as Kosumo, they decide to make her a donor, since Himiko is sure to die as a result of the accident. Kosumo recovers and moves back to Tokyo, but later finds out that Himiko's blood isn't the only thing flowing inside her…

From Operation Boredom:

Jin, son of a Count, has a dark past that follows him everywhere. Now a pirate, he's recently acquired a new set of slaves to sell. However, one of them, Lisa, sparks something inside Jin. Could she be the one to get through his cold, ruthless, and dark heart and see what's really inside him?

Sawamura Eita is kissed by his best friend on his 20th birthday while they are both drunk. Eita believes it all to be just a dream. But was it?

The third entry from the infamous God series of web manga. This is what happens when the creator of "Umbrella Sword" tries to make a love comedy.

Popular for Junjou Romantica, Shungiku's earlier works were more samurai romance/yaoi of this sort. Here we have a basic spoiled brat and his bodyguard developing feelings for one another.
by Yasha

Oneshot

Junya still has Kyouichi’s handkerchief from a long time ago when they met. But now, after their parents got married to one another, they meet again this time as step-brothers. Junya wants to return the handkerchief, but isn’t sure that Kyouichi remembers him or that fateful night. Kyouichi also has unusual pains that suddenly develop and the only one he can contact is Junya. Are these pains just an excuse to be able to touch his step-brother?

English publication via Renta!

From Chibi Manga:

A poor commoner chatterbox accidentally entered the celebrity high school and the unthinkable happened…?

Includes oneshots:
The Female Teacher is 16.
Mouai Idol!! (Blind Love Idol!!)

Just before their high school graduation, Hajime lost his virginity to his best friend Hanatarou. Soon afterwards, Hanatarou disappeared from his life without a word. Three years later he's back...but as a cross-dresser! Hajime is dumbfounded, but have his feelings really changed?

The confused love between two earnest, awkward men.

From Fujoshi Bitches
Chemistry teacher Kousaka appears before Takuma, who is living the peaceful life of a high school student. This teacher who doesn’t act like a teacher captures Takuma’s interest, but unexpectedly the teacher’s words touch his heart, and interest transforms rapidly into love. These two, who met over a shared cigarette, go beyond their respective roles and begin a new relationship!

Includes an all-new extra about their rich love life after Takuma goes to university.

1-3) Torokeru You na Kiss wo Kanadete
For two years, Neo-chan has been dating the vocalist Gaku. After their first night together, she writes and sings a song which overflows with her feelings for Gaku. After hearing her song, Gaku seeks out Neo’s talent… but when things become serious, a dangerous mood develops. The two then lose connection for 3 months. During that time, Neo finds out that Gaku has a major debut with the song she wrote?!

4) Owaranai Koi o Sasayaite

5) Ban confessions!

BLUE MOON BRIDE

Hannah threw her letter of resignation at her boss, who called her "below average." Still full of hurt, she visits the Blue Moon Inn, where the inn owner suggests she take a walk in the garden. That night was the night of the blue moon-- the second full moon of the month. Under the magical moonlight reflected on the derelict stone-walled church, a rude yet sexy man suddenly appears. To Hannah's astonishment, it is her offensive former boss, Roth Jerric! Why would fate punish her like this?

English publication via Renta!

From Blissful Sin:

Ever since he was a child, Prince Uriel has always dreamed of searching for the lost city of Rowadis rumored to be buried somewhere deep in the desert. One day, he manages to sneak out of his country to join an excavation party in the hopes of learning more about his beloved Rowadis. However, the barren land turns out to be a dangerous place for the prince and he is captured by the savage Seldira clan. Follow the adventures of the young prince as he gets tangled up with the handsome leader of the Seldira and unlocks the mysteries of the desert.

From Serenus-Dreamers:

After losing their parents, Fumino and her brother hop from one relative to another. Getting tired of all those moves, she finally decides to quit school and work to support her brother on her own. As they sat on a park bench, her teacher appears in front of her and agrees to her demands of marrying and supporting both her and her brother!! Is he serious or just playing around...?!

--

Also contains the oneshot, Tsukio to Himawari, in vol. 1.
Asahi-kun is a carefree junior-high student, never attaching to girls even though he enjoys going with them. But when the school's number 1 honor student Mitsuki "cyborg" Konno asked him to a 1-month date, in exchange for the front row ticket to his favorite singer's concert, he was forced to accept. He only has to show her what it feels like to date, right? He is ready for that...however, what he's not prepared for was his heart's reaction...

From CMX:

Will a half-mermaid, half-human girl bring an end to the feud between humanity and the mer-people — or bring about the destruction of all life on Earth? As a merman named Shona is returning to his birthplace to spawn, he meets a young human, Jimmy, who suffers from amnesia. Together, Jimmy and Shona set off to find the missing girl. Will they be able to avert a mysterious prophecy, or will finding the secret of Jimmy's identity delay them enough to set Earth on the path to destruction?

Chapter 1 : XXX Allergy
Canis Major Scanlations:
Growing up in an environment full of all kinds of animals, there’s only one animal that Shouhei loves and that’s rabbits. Because of his love for rabbits, he sometimes helps out in a rabbit specialist shop. And there, he meets Mito Itsuki, his unrequited love. However, he has a secret he has to keep no matter what. Would he be able to keep that secret in order to stay close to the one he loves…?! A cute and short love story by Hinohara Meguru.

Chapter 2-3 : Secret XXX
After going through many hardships, Mito and Shouhei finally became lovers. Just when their love is starting to bloom, Mito begins to act strange for some reason. Shouhei still doesn't know much about Mito so he can only sense Mito is hiding something from him. One day, Shouhei saw Mito with another guy in his car?! What could Mito be hiding? Can Shouhei keep his faith in Mito.

Chapter 4-5 : Relation XXX

Extra : Happily ever after