From Blue Flor:
A domestic comedy about couples in apartments.

A high school girl who lives alone in her parents' home, away from her sister and mother who are working as actresses in Tokyo. Under such circumstances, my family's birthday, for a long time, somehow, popular actor Shiraki Araki appears instead of the family! Araki rushed to the confused Yakko, saying, "He became a star to help him find her." "Keep me"...?! A gift (?!) that arrived at JK who was worried that there was nothing for me. It's the start of a half-lived love comedy with a superstar!

From MegKF:

A talented young Japanese chef deals with working for the father of the only chef who always gets the best of him. But what are they going to do as this rivalry develops into something else?

There are two extra at the end of each volume. Volume 1 extra is called A Man You Can't Resist. Volume 2's is an extra from Boku no Koe, My Changeable Voice.

From Nakama:

When the unmotivated editor of a mahjong manga magazine, Sakaguchi, stops at a convenience store in the middle of a business meeting, he is reunited with his senior high school underclassman, Fujishiro.

Fujishiro's ability forced Sakaguchi to abandon his dreams of becoming a mangaka, but Fujishiro has stopped writing and is living the life of a part-timer.

In order to get Fujishiro to draw manga once more, Sakaguchi meddles in Fujishiro's business.

With its novelty, Fujishiro's manga becomes popular, and when he's lured away by a major publishing company, Sakaguchi thinks that that is the end of their relationship ...

The title work of the story of the ten years' desire of a violent editor and a useless mangaka, plus the sequel of the popular mangaka and his manager, now a couple, and others, all compiled in a single volume -- a brand-new work compilation!

1. Candy Trap

2. Hachimitsu Method/Honey Method
Sakura realizes that lasting love is possible with Mai, even if she's a woman.

3. Tadashii Pantsu no Sutekata

4. Naisho no Kaijuu-chan

5. Sakasama Buranko

6. Ashita kara wa Mou Nomimasen/From Tomorrow on, No More Drinking
Madoka and Yuina were in the same high school friend group but went separate ways in college. Now they've run into each other at work, what will be confessed if they get drunk?

7. Girls Bitter Ambitious
Mei discovers that guys don't make her feel the way her best friend Tomoko does.

8. Dark Cherry to Shoujo A

9. Onnanoko Party/The Girls' Party
Sakura and Mai come to an understanding.

Nishino Yuzu was all pumped to start her second year of high school, but as she begins her new school life, she meets a strange new classmate in Shinjou Kanata. "I don't understand him. We can't get along." or she thought, but through glimpses of how kind and dependable he is, she gradually begins to take interest. What could this feeling be...?
Here you'll find a girl that you can't help but cheer on!

A father and son love each other dearly. But when Emily, a girl from Kazui's past, visits them in Japan, their relationship starts to crumble under the threat of their own thoughts. . .

There is also another one by the same name scanlated by nodeadline by the same author but a whole different story.
Basically one doctor is in love with kazui (not sure if it's the same one from nakama version,) and another dr is in love with him, it's quite a sad and tragic story, but its a good one.

A supernatural mystery crime thriller miniseries taking place in the near future about a young shojo mangaka who must solve a strange murder mystery involving a Halloween pattern from his work while trying to save his fellow mangaka who was framed for a murder he didn't commit and find the real culprit of this deadly bizarre crime.

After being saved twice from an asthma attack, first year student Inoue falls in love with Karasuma, a boy who’s not interested in love. After being rejected several times, Inoue recieves warnings that Karasuma is a dangerous person… but will that change his feelings?

Mylene loves fun things. Whether it be fine arts, sculptures, drawings, or music, she loves them all. However, all those things had gradually disappeared due to the long-standing war. Thus, she decides to cast a time freezing magic on herself to awaken at a period after the war. Waking up 2000 years later, there was only a wasteland around her. Thus began her leisurely life with her golem maid. However, meeting with the villagers, that takes a turn. Will her wish to live a leisurely life be granted?

When J, the man everyone fears, returns to town, the city's delinquents are in an uproar. Some challenge him, some try to use him, some try to get close to him. Where will J end up at the end of the long struggle...?

Serialized in Weekly Young Magazine from 1983 to 1984.
Volume 1 released in September 1984.
Volume 2 released in February 1985.

An exciting new manga from Mori Kotaro, the artist for the manga adaptation of the famed Gurren Lagann! Humanity is plagued by the undead Reversed, and no one can stand against them. No one except... a high school girl named Shion-chan from another time? She'll resurrect this rotten world with her maiden fists! (Source: Mangamo)

On Earth, spirits roam. As thousands of years pass, many curious and peculiar species are birthed. Some spirits satisfy their own desires by devouring weak human begins. With this, a group of humans possessing special powers came into being: exorcists, wizards... Within them, include those miraculous beings who defy natural laws. With one pen, they are able to redraw one's features... We call them: Skin Painters. The manhua tells the story of the master (The Skin Painter) and his disciple as they travel the world.

When high school student Sora Kashiwagi finds himself staring down a mysterious oversized package sent to him by his self-proclaimed "adventurer" father, the last thing he expects is for it to be opened from the inside... by a little mummy so small it can fit in the palm of his hand!

An up-and-coming genius throws down his gauntlet! Frenetic & violent SF buddy action!

Meet the high school girl duo Line and Ann! Their job is to crack down on evil illegal aliens living on Earth, as agents of the Planetary Immigration Bureau!

High school girls X aliens X shootouts! Get your dose of violent sci-fi buddy action right here!

In senior high, Yang Mu Li and Xun An drifted apart because of a misunderstanding. Seven years after graduating, they've both returned to their alma mater as teachers: Yang Mu Li as a two-faced math teacher, and Xun An as a cool and aloof PE teacher. But it seems that Yang Mu Li... doesn't recognize Xun An?!

Though many things have remained the same, the people themselves have changed. Can the feelings that once died come back once more? Meanwhile, the secrets they held during that one shared year of high school are slowly revealing themselves...

---
A webtoon by the author of Love Like Cherry Blossoms!

Yoshida ♂ and Dobashi ♀ are the only students at a branch school in the countryside. Later they are joined a third student, Kobayashi ♀.

Sequel to "+a no Tachiichi". Imagine getting summoned to another world, and then being told that you were a mistake!? That's the situation our main character, Kakura Norio, has gotten herself into. Join Norio-chan in her attempts to survive in a complicated isekai political situation, just like Satoki in +alpha no Tachiichi!

After a long day of adventuring, Bare and her party members are on the lookout for romance... and thus begins their Around 30 Quest!

The ephemerality of all beings, a thousand faces with all characteristics, complicated feelings, and humans that aren't humans.

Prince Duan Yu, having run away from home many times, is finally about to welcome a huge turning point in his life. Seeing the most beautiful woman in front of him, he brazenly calls out 'Fairy Sister'!