From Batoto:
Kikuno Kei, nicknamed "Kay", is a normal university student and a part-time hitwoman.

The story of a mute girl and the girl who befriends her.

Sawari likes to harass her childhood friend, Kiyoto. Sexually.

A spin-off of the various works of Kamachi Kazuma. One day, Kamijou Touma (A Certain Magical Index) faced yet another misfortune. His toilet was broken and spraying water everywhere. As he was lamenting his misfortune, suddenly he appeared in a strange place along with Index and Misaka. Soon enough, more strange people begin appearing...

Includes:

A Certain Magical Index
Heavy Object
The Zashiki Warashi of Intellectual Village
The Circumstances Leading to Waltraute's Marriage
A Simple Survey / A Simple Monitoring
Killer Princess and Deep End

Her secrets that only I know...

Izuki Hayashi, a timid otaku who has just entered high school and wants to become a manga artist, is sitting next to a very scary-looking Yankee JK! The way she talks, the way she looks, the way she acts, everything about her is terrifying... But it turns out, she has a lot of unexpected weaknesses?!

Shouko is a girl growing up in 90's Japan who just wants to stay in and play games on the Playstation. However, she is often visited by her grandma, who tries to make her do more productive things.
Lately, obaa-chan seems to be becoming more tolerant though...?

Tagline: "A Granddaughter x Grandmother x TV Game (and sometimes snacks) manga!!"

Her secrets that only he knows...

Itsuki Hayashi, a timid otaku who has just entered high school and wants to become a manga artist, is sitting next to a very scary-looking Yankee JK! The way she talks, the way she looks, the way she acts, everything about her is terrifying... But as it turns out, she has a lot of unexpected weaknesses!

Leader of hero squadron "Gerato 5 (Five)" aiming for world peace, Aikawa Fudou and fight leader of secret society "Gecko" aiming to conquer the world, Magahara Desumi ... there was a deep “fate” between the two of the organization ... !!

Mitsuru Masamune, a mild mannered high-schooler who hasn't had much of a presence since his birth one day had a roommate move in.
A silver-haired, blue eyed exchange student all the way from Germany, Leo.
They had a dignified appearance and had a cool way with their words with no room for timidity.
He used to think that Leo was a being far off from someone like him till he got to know about a secret of his after which their relation got a bit more special...?!

The manga centers on 35-year-old businessman Ryūichi Yamadera. Ryūichi travels around the country on business trips, and his sole pastime is trying different foods at local restaurants. He also ends up sleeping with the various married women he meets at the restaurants, while also being married himself.

The succubus' target was a second grader!? So begins a seductive comedy with a clumsy succubus and a mature grade schooler!

Contrary to her appearance, Hatsuse Sakura is an idiot. Because of her, "honor student looks," she is appointed as the class president. To meet up to everyone's expectations, Sakura tries her hardest, however, for some reason since then Shinokura, who is rumored to be a delinquent, has been starting to approach her? The romance of two awkward people.

From the author of Denkigai no Honya-san and Dansai Joshi comes a short-length comedy about Matsuboshi Raidou-kun and his seatmate Aharen Reina-san, who has problems determining how chummy she has to be when approaching other people. Get up close and personal with the small, quiet but unfathomable girl, Aharen-san!

From Easy Going Scans
Everyone knows women are tricky beings, with layers upon layers of secrets they hide, but there are some secrets women must risk everything in order to keep hidden! These women with such hidden secrets are being revealed in the series, "Dear, Only You Don't Know!"

In this world, there exists monsters called Kajiki. They are huge and scary, for they were created to be eaten by gods. However, they are also very delicious…! Let the battles between monstrous food and a young chef begin!

Tamaki, a girl who died in an accident, became a zombie and crawled out of the grave to convey her feelings to her childhood friend. Shin, a lonely high school boy, remains confused by the fierce attack of Tamaki...!

A surreal romantic comedy!

After years of being unlucky with girls, Ishimaru Daito only wishes to enjoy his high school life with a normal, cute girlfriend. However, after losing a game to his two new seniors Sasahara Kiyoka and Tomochika Asami, he is forced to join the < Humanism Studies > club which is actually a torture studies club. Will Ishimaru get the normal high school life he always wanted?

From MangaHelpers:

The age of the maid robot has begun! Now, each family has at least one maid robot in their household, and Souta's family is no exception. Souta grew up with his maid robot since he was a young boy. He has learned that there are people out there that have fallen in love with their maid robot, but he is determined to not be one of those people.

His maid robot, Tsukushi, will do whatever it takes to make her master happy!

Nana Shimazaki, is a manga artist, but her work doesn't sell well. She's dead broke, without even enough money to pay for AC. Just when all seems lost, she finally gets a request for a commission, but somethings a little different about this job...

4-koma manga by Arai Cherry, depicting the everyday life of elementary schooler Mio Maeda.