From Boku-Tachi:

One day Kanna comes home from school to find that the grandpa she hasn't seen in many years has sent her a huge package! On the box it says that it's a new invention. What could it be? Kanna reluctantly opens the package and inside finds what seems to be...a boy?!

N/A

A high school boy who's always considered himself to be an alpha finds out that he's an omega?? And his destined partner is a kid?

Taken from Cheap Manga:
This series is self-titled “Fleshbomb Masterpiece.” The first chapter is full of flexing muscles, sweating, flowers, and more flexing.

The beautiful yet aloof Midori and the very outgoing Takahiro are college friends. One day, during a drinking party, the astute Soejima senpai finally got Midori to admit that he is gay, even though he was trying to ignore that fact. As he slowly comes to terms with his own homosexuality, he also discovers the truth behind his friendship with Takahiro.

UB (Underground Brawl) is an ultimate fighting tournament that doesn't follow the standard rules of the official sport, UFC (Ultimate Fighting Championship). Consequently, this tournament is hidden from the public and has become a playground for the upper class. But one man is destined to end the cruel government's uprise. That man is Jack Knife. The story will mostly focus on Jack's fighting encounters in the UB tournament and how he will recover his forgotten past.

From Peccatore Sanctuary:

Newbie manga editor Hatori Sekima has always admired the well-known shoujo mangaka Honda Yuki sensei, hoping one day to work with Honda sensei. But when Sekima finally gets the chance with work with Honda sensei, he discovers that this Honda sensei is not the cute girl he imagined, but a handsome man who seems to be 'interested' in him immediately...

Manga anthology based on DMM and Nitro+'s browser game Touken Ranbu -online-

Collection of stories

1-2) Kindly Dinner Table/You Can't Eat That
Ordinary university student, Kou, is living with Naoyuki; a gentle and timid vampire. Frightened of his narrow coffin, the cowardly vampire doesn’t scare Kou, but can Kou resist becoming his “lunch?”

3) The Werewolf Afflicted on the Night of the Full Moon
An extra specially drawn compilation about Naoyuki’s older brother, Yukito, and a werewolf called Seiichirou!

4) Friends Season
High school students Kura and Kuri are best friends, but when Kuri confesses to his friend Kura, he's shot down pretty quickly, after all, Kura has a girlfriend. But now that he knows, Kura can't stop thinking about his friend in "that way".

5) Entangled, Untangled
Student Yoshino enjoys teasing Miki-sensei, even making the teacher tie his tie every morning. But how serious is Yoshino, and though Miki-sensei doesn't treat him like the other students, does that really mean love...

6) The Truth is You're Kind
Breaking up is hard to do for one young couple that can't seem to escape their memories of each other.

7) Beautiful Person
An 8 page short about a mysophobic man and his lover.

8) Later, at the Dinner Table
Kou and Naoyuki omake.

1) The Reason I Take One Step Forward
Young couple Hirota Naoki and Yoshizawa Hiderou have a dog-and-owner relationship, with Hirota always taking care of the clumsy Yoshizawa. But when Hirota gets sick at school and tells Yoshizawa not to follow him home, is there anything "the dog" can do to be helpful to his "owner"?

2) A Rare Look Into the Incompetent Seme

3) But I Love You for all That

4) Tic-Tack

5) When the Snow Accumulates

6) Centimeter Rhythm

7) Jikosaiten

8) Sangatsu no Tobira

9) Hakoniwa no Tokiwa

10) Kataomoi Nochi Renai Naka, Tokidoki Ueno Sora

Story 1 - Don't Say Any More, Darling
The only thing keeping Tadashi, a struggling song lyricist, alive is food handouts from Kouhei, a successful doctor. In fact, Tadashi has been leeching off of Kouhei for practically their entire professional lives.
Before they arrived at this queer living arrangement, they once enjoyed a little fling back when they were in high school. Though the affair ended briefly afterwards, they've remained fast friends still. But Kouhei's parents want nothing more than to see their son settling down. As Kouhei is pushed ever more forcefully into an arranged marriage, will he finally admit that he sees Tadashi as something more than just a friend?

Story 2 - My Eternal Sweetheart
Sir Arthur, a teenager, has immune deficiency syndrome. He can never leave his house because of all the bacteria outside, thus he feels eternally bored. So to satiate his boredom, he asks his brother to make him some sexdroids to have fun. But, his restless boredom still remains...

Story 3 - Fairyland
"Because humans had become so foolish and indecent, God punished them by erasing them from the Earth."
It's been a month, and there was no sight of humans except for himself. Sawada Ryohei thought he was the only one left, until he spotted a bespectacled boy. And it turns out that, this fairytale wasn't a good one.

Story 4 - One May Day (Josei)
A professor went to a restaurant one day, and it wasn't that good. But the little things about the owner(?) Sachiko, like her pretty forehead, made him a regular there. Little things can change everything.

Story 5
A young, beautiful, talented pianist. That's what he was.
No longer is he young; No longer does he have men in lines just waiting to embrace him. Because he indulged in his one-time fame, he neglected everything else and now has become any regular bearded Joe.
Now in his 40s, he just wants his strike in love! But does he still have it

Each chapter follows Fukuzou Moguro, a traveling salesman, and his current customer. Moguro deals in things that give his customers their heart's desire, and once his deals are made and their unhealthy desires are satisfied, Moguro's customers are often left with terrible repercussions, especially if they break the rules of his deals...

1-4) Sore wa Yappari Koi no Sei
One day, the unlucky Taira dives face-first between the legs of the judo club captain, Kusehara! Kusehara then insists that Taira 'take responsibility' and starts to enact various perverted things to him every day!

5-6) Sore mo Yappari Ai no Tame
Ibuki and Kazoumi are childhood friends and they live together since Kazoumi's parents left the country to take care of overseas business arrangements and because Kazoumi's father and Ibuki's father are friends. Since then Kazoumi takes care of Ibuki, who is the spoiled-unaware type, but he wants more....

Mimaru is no ordinary garbage collector. He's a badass ninja who uses trash and other disgusting items to defeat his enemies. He also protects the unprivileged people in his surroundings.

[From Beautiful Soup]:

Katsuse Rin, a troublesome student that's always breaking the rules ends up falling in love with a member of the school discipline squad, Kuramare Fukaten. They run into some problems when Katsuse wants to be more open about their relationship, but Kuramare does not want his school life to be affected by his private life. Will Katsuse and Kuramare be able to overcome this and be the happy hugging, kissing, dating couple that Katsuse wants, or will Kuramare be afraid to let himself be caught by the students that look up to him, forcing Katsuse to move on with someone else?

An aspiring manwha author wannabe who was never really interested in girls finds a girl of his taste. However, the girl is taken. Even so, he still goes after the girl. Will he succeed?

From Viz:

Miku Yamada has a longtime crush on classmate Kyohei Fujioka. But no matter how many times she tries to show him how she feels, clueless Kyohei just doesn't get it. Frustrated, Miku gives up on him, only to have him start calling her "Cactus" for being prickly when he's around. Will Kyohei ever figure out Cactus's secret?

- Includes other stories:

Okosama Brat
Taishi stays at Rie's house because his parents work overtime. Rie thought that he was actually her real brother! Now, Taishi says that she's "idiotic now and then". People think of Taishi as cool and mature, but Rie knows that he's just a brat inside...

Sono Saki no Sweet
Hidaka Mao was confessed to by her crush Chihiro-kun in junior high, but as soon as they started going out, she became unable to communicate with him. She is still confused about her feelings, but will this year's Valentine's day bring them together again!?

1-2) University student Michiru's secret lover is Japan's first celebrity idol Rihito! His relationship with Rihito has always been sweet, but is this stable and happy life in danger of being destroyed soon?

3-4) Endless Summer and Lover's Summer continue the story of Shizuka, son of a now shamed rich family, and Jin, the famous baseball player, from the 3rd story in Star na Koi. Shizuka has run away from Japan. Devoted Jin finds him in New York, but Shizuka's guilt is eating away at him...

5-6) Honey in the Dark and Mermaid in the Dark make up the final story. A blackout has plunged a tunnel into chaos. A blind beauty and the panicked man whom he helped out on that day have an unforgettable and powerful connection. Their relationship is passionate, but is it destined to fail because they 'see' the world too differently? Also, there is a mystery behind his loss of eyesight and it seems sinister...