Mizuki and Kazuya, childhood friends, are 3 years apart.
It's not really a so-called "Age Gap" but that makes some distance between them during their youth.
From their childhoold to the present, story will be told about these two who are 3 years apart.

Links:
Artist’s Pixiv: https://www.pixiv.net/member.php?id=596062
Artist’s Twitter: https://twitter.com/shimazakikazumi

From MangaHelpers:
Aku Maya is a demon, come to do some hands-on practice in the human world. She's living at a boarding house, attending school as a human girl, and keeping her demon nature secret from her close friends Sui, Sawa, and Arata. Maya's supposed to be increasing and collecting the negative energy of the humans around her with her 'evil checker' phone, but she doesn't seem to be able to take much pleasure in it. Besides that, what would her friends say if they found out she was a demon?

A symptom which causes one to physically regress till the point of disappearance. A pharmaceutical company which claims to be researching a cure and the cause for this syndrome. What are their motives? And what does a dragon slayer and even a handful of demons have in relation to all this?

We struggle to live because we have hope. We try our best to be happy because there is someone whom we should protect. We believe in tomorrow and walk forward because there is a person in the far off distance. An older brother and younger sister who spend their days waiting for their beloved mother. A checkered fate suddenly visits the older brother, who is thinking of his sister. In the middle of a downpour of rain, the "story" begins.

An anthology of Bobobo-related tales.

Contents:
- Stinky Mountain Action Story
- Bobobo-bo Bo-bobo: Akamaru Version
- Bobobo-bo Bo-bobo: Chapter One - Bo-bobo and Beauty
- Bobobo-bo Bo-bobo: Chapter Two - Bo-bobo and Captain Battleship
- Bobobo-bo Bo-bobo: Chapter Three - Bo-bobo and Don Patch
- Bobobo-bo Bo-bobo: Chapter Four - Bo-bobo and Gasser
- Invincibleman
- Fierce Battle!! Rock-Paper-Scissors Island

From Etc:
Dr. Katou is an ambitious woman who seeks to revolutionize the corrupt and inefficient Japanese medical system from within by becoming a professor in a teaching hospital. She enlists a maverick surgeon, Dr. Asada Ryuutarou, to help her with research that would catapult her to a professorship should they succeed and publish. However, Asada's refusal to conform to the system soon threatens to destroy not only her plans but her entire career. Katou is prepared to do anything, including going along with the system, in order to achieve her end goal, but she begins to question whether she has gone too far as Asada's actions bring many of the system's shortcomings to light.

Note: Won the 50th Shogakukan Manga Award for general manga in 2005.

The newest female supermodel Zhong Xiao was caught by reporters on the night before the big show quarreling and kissing her female friend, causing an uproar in the country! After intensely fighting with herself, she finally decided to come out. However, the modelling industry was also hit hard, and when Zhong Xiao began planning to leave the Chinese market, she received an invitation from a designer who was returning to China-- Bai Fumei..........

After successfully getting hired as a fashion designer, Mai rewarded herself with a trip to Kyoto and was just enjoying herself when she got struck by lightning at Honno-ji. She then loses consciousness awaking only to find Honno-ji ablaze. In the spur of the moment, she saves a person from being attacked, but it turns out he's Oda Nobunaga?! The popular romance game is finally being published as a comic!

Senoo Anna recently got a job at a social game company called Kami Games, which turns out to be run by actual Gods.
Sexy... a selfish idol... an alcoholic... someone who loves cute girls... various other Gods and... a black lily?
Game development begins!

We all know that a lot of the booty of the golden age of explorations made it into museums. The British Museum in the C.M.B. story, which had custody of the recondite scientific curiosities and artefacts collected by explorer/adventurers and stored in a Wunderkammer, decided to study the dusty arcana in the 19th century. Three investigators dubbed the "Magi" were appointed to do the research, each given a ring embossed with the letters C.M.B. Fast-forward to present-day Japan where Sakaki Shinra is the curator of a museum of oddities. He now has possession of the C.M.B. rings, indicating that he has been granted the status of guardian of knowledge like the Magi that preceded him.

From Sherbet Lemon:

Kaphisilia Ailide is the daughter of a noble duke. Ever since the disappearance of her elder brother, her parents have put all their pressure on her. Everyday she has to have sword fighting and etiquette class. Days before her father's birthday, she went to a forest of her family's confer territory to get him a present. All of the sudden a death wolf leaped out and tried to kill her. And then this strange guy...

Lizia is reincarnated into an otome game world as a mob character.

She decides to live with two lives worth of filial piety, however, she has been betrothed to Bernhardt, the last villain in the prince' Route. This is the struggle of Lizia as she tries for a peaceful life.

Xiao Man, the beloved heir to the north area's martial arts club, suddenly decides to transfer to a south area high school to pursue "him". However, on her first day as a transfer student, everyone –including the teachers– mistakes her for a male delinquent. How will she get the boy she likes to see her as a love interest instead of a "buddy"? Adventure into the life of Xiao Man!

In a world where youkai and humans attend school together, a boy named Atsushi Fukuzumi falls for snow youkai Muku Shiroishi. Fukuzumi's passionate feelings melt Muku's heart...and the rest of her?! The first volume of an interspecies romantic comedy you're sure to fall head over heels for!!

A collection of one-shots... 1) A long time ago there was a princess who was not afraid of the silver demon. Now after several years she has been reincarnated...

The story is about Hare, a 10 year old boy who lives with his mother Weda in a small village in a very strange jungle. Hare's mom is a bit of a "party girl" and likes to sleep in all day and party with her girl friends all night. Things change one evening when Weda comes home with a little "playmate" for Hare, a pretty little girl named Guu. But when Hare wakes up the next morning, Guu has "transformed" into a sullen, nasty, and sarcastic joker who takes great pleasure in making Hare's life utterly miserable. Guu can also swallow anything and regurgitate it whole. Guu also seems to have various magic powers, which lead Hare to consider her a demon of some sort, but he can't convince most other people of that.

Unoki-kun, a boy who's been bullied since elementary school, ends up becoming the exclusive errand boy of the top delinquent of his school, Toramaru-san, who told him "Be mine" right after entering high school. But the truth is that Toramaru-san meant it as a confession of love!! This is the beginning of a love misunderstanding between Toramaru-san who thinks she's in a relationship and the beta Unoki who think he's being bullied.

“Elizabeth!” as someone called out to her, she turned around just to see a fine nobleman in front of her.

Elizabeth, a noble lady from the countryside was suddenly grabbed by the arm and abducted.

According to Sylvester, the heir to a Duke household and her so-called "kidnapper", she looks exactly like his younger sister to the point they even shared the same name ‘Elizabeth’, the duke's daughter who went missing after eloping.

In exchange for lending her penurious family a help, the vicious lady Elizabeth who takes every opportunity to her gain, begins her… splendid life as a replacement…?

Yonakano Reiji was on his way to school taking his usual route. But this day fate was at his doorstep, it was this day that he met his fated one. The only problem was that his fated one was a ghost.

The overproud president, the shy little secretary, the South-African black diamond princess, the special force female bodyguard, and the silky beauty who loves to eat carrots will passion you out. What kind of passion? The fate of entanglement or the calculation of the mind, into the genius master, take you to appreciate the different assistant life.