Extremely wholesome onee x shota comedy manga by Shirano Akihiro.

From Intercross:

Origawa Industry Public High School is a school filled with rough men. There's only one girl in this high school packed with wolves. But this little sheep isn't an ordinary person!

Also includes the following short story:
Konna watashi ja nashi desu ka?!

Yanagi's dad is a president of a large hotel, he himself is handsome and clever, always wins the favor among girls. Moreover, he's always on the top of class and champions in all sports meetings when he was in primary school. But after he met Kujou, a transfered student, he had never savored the taste of victory in any single match with this girl for ten years. "Let's bid for final victory, Kujou." There here comes the last game. Will Yanagi fall in love with Kujou while he hates his competitor but cares so much about this girl?

The story revolves around Objects - powerful, massive weapons that change the course of warfare - and Elite Object pilots. An odd Elite girl named Milinda meets Quenser, a student who aims to become a Object mechanic, with the soldier-in-training Heivia on a snowy battlefield.

"One boy upset over his soft, cute appearance. The other boy, because of that boy's pretty and cute appearance, deliberately provokes and fans his anger to reveal his own Masochistic traits. What will happen between them?"

Athena, goddess of wisdom, goes back to school to seek revenge!

Doumori Hiroto is a mysterious boy from a lineage of ancient spiritualist who have been guarding the pathway to the underworld for a thousand years.

But he was born with a defect caused by bloodline of magicians mixed into his ancestry.
He possessed both spirit and magic power instead of either, yet he was able to use neither.

For this reason, his grandpa took him to his friend, a chinese sage, to have Hiroto being taught the sage cultivation.
He quickly mastered the sage path and was said equal to a hundred years cultivator.
Somehow, thanks to his sage power he became able to wield his original spirit and magic power.
However, during an incident where he had to unleash his full power, the recoil of that power caused his existence to be erased from everyone's memory.

Kouno Akira, class president and otome game lover, has decided to never get involved in 3D love. One day she bumps into Sakurasaka Pure who tells her straight that she would be Akira's future "Amore". Not only that, Pure even transfers to her class, follows her around until Akira runs off, telling her she does not intent to get involved in 3D love. Pure doesn't give up and tries to fulfill the wish of the 24-years-old Akira, who told her to look after Akira's high-schooler self.

"More-than-friends but less-than-lovers", that type of sweet-and-sour youthful story starts here.

"I'm sure we'll get the target we're after."
Shotaro, a ruthless killer, code name "S".
But one day, the target is the leader of the "Waruiyogumi" gang's only daughter - Furukawa, 17 years old.
The moment he points the muzzle at her, he feels something he never felt before! Shotaro feels his heart grow...

A genius killer, now a young girl's bodyguard?
The heartful killer comedy begins.

Tougo Ushiwaka reunites with his childhood friend and first love Ren Ryuugasaki after about 10 years. However, Ushiwaka had been traumatized to discover that Ryuugasaki, who he had thought was a girl, is actually a guy with a fondness for cross-dressing.

The manga follows the everyday lives of five siblings—four sisters and one brother—who share a multi-unit apartment (danchi).

A sophisticated collection of tales, ranging from the macabre to heartwarming to wacky. The trials and tribulations of daily life.
Volume 1: P no Higeki
Volume 2: Senmu no Inu
Volume 3: Akai Hanataba
Volume 4: Unmei no Tori

In order to help the romance between the prince and the heroine blossom, Meliarose has been chosen to play the villainess! However, no matter what she does, their relationship is not going where she wants it to?!

From Game of Scanlation:
Trainee Knight Trudia gets kicked out of the knight squad because of her hot headedness. In midst of trying to find out where she'll go next she finds an old man that's in danger. She runs over there without hesitation in order to save him only to meet a man that'll change her fate forever. A story of a dying girl and an undying man trying their hardest to live.

In the year 2045, VR-Capable brain implanted communication terminals have become widespread. With the advent of this world changing technology, the world has become an almost unrecognizable place. From e-sex indistinguishable from the real thing to advanced artificial intelligence, it seems anything has become possible. Except for, of course, the redemption of my pathetic love life.

In a seaside city, Fuuko, a young girl who likes places where she can feel the pleasant wind, joins her high school's sailboat club. Despite being a complete newbie, will she be able to compete in the tournament...? A marine sports 4koma drawn from the author's experience!

I applied here since it's a close walk from my house. But it's really full of girls, huh? In this 4-koma series Tsuda Takatoshi is a new student in the recently gender-integrated high school. He's asked to join the student council as the vice president. Thus begins his days as the only normal boy among 3 female student council officers...

Like an RPG character, Dannoura Choushi possesses a constitution that allows him to respawn at the last place he slept whenever he dies. When he saves Yamazaki An's life, she falls madly in love with him. Will he able to respond to her heavy love? The curtain opens on a sinister, yandere comedy.

A warrior ruled by chaos and darkness and killed his family in another world. One day, crazy about madness and revenge, he knows about the existence of Kelg's bar. There, the reborn (?) Are searching for friends to subdue the Demon King day and night.
Urus immediately goes to the bar to be chosen as a rebirth, but he is imprinted with the mysterious word “R” and is recognized as a weak by an unknown summoning ceremony (Gacha). And touch the darkness of the world !!!
What is R, an unknown summoning ceremony !? And what is the darkness of the world !?