The protagonist is your average, everyday, Korean school student. That is, if not for his obsession that aliens live on Earth disguised as humans.

Much to his surprise, he was right, the aliens play a game called "Avatar" where they take human form and live human lives. And because of a glitch he caused in their system, now his very life could be at risk.

Now he needs the protection of an Admin of the "Avatar game" or else he could very well die!

From Wikipedia:

The story is about Kozue Ayuhara, the new girl who transferred to Fujimi College, who tried out for the school volleyball team. Her friendship with Midori would develop, and her talents would impress coach Honga more and more each day. Though she showcased extraordinary volleyball skills, she would make enemies with Yoshimura, the star of the current team. Kozue would discover that being at the top would bring stress, incompatibilities and other dilemmas into her life. Her high expectations of becoming the best volleyball player in the school, Japan and eventually the world, would set the tone for the drama to follow.

From Del Rey:

Since ancient days, the Gaius School of Witchcraft and Wizardry has trained the fiercest swordsmen and the most powerful wizards. Now one boy could become the greatest of them all. If he studies hard. If he is true to his friends. If he believes. And if he survives…

This manga takes place a few years after the two lead males have graduated from high school. One of them came out in high school, and the other was a scary senpai who kind of took care of him. But now they meet at the same office, several years later, where the kouhai has yet to come out of the closet...

Fukaya Shinichiro's whimsical grandfather has decided, quite out of the blue, to hand over one of his many holdings, a bookstore known as the "Fukayadou", to his high school-age grandson!

Shinichiro is understandably reluctant, but when he sets foot in the store only to be immediately drawn into a world full of fantastical books that thrive on human emotions, and meets the handsome blond man with a mysterious smile who works as its manager, he realizes his life will never be normal again.

Gag-Comedy

Tsubasa Nonomiya transfered to a new school because she wanted to be the manager of the boy's basketball team. When asked, she claims to hate basketball. So why did she transfer schools? The answer: Takaya Misaki. Who happens to be on the school's soccer team, not on the basketball team. *From: Baka Updates*

From JShoujo Scans

Harumi's your typical grade 9 girl. Sure, she still sleeps with her stuffed animal that she dubbed "Umetaro," and her ability to sense snow before it falls is labelled as just plain "weird" by her friends, but otherwise, she's your average girl just like any other.

When her mother accidentally ruins her stuffed animal though by accidentally spilling coffee all over it, it sets the ball rolling for a series of events that changes her outlook on life.

She even meets a young guy working at a local knick knacks shop who reminds her of her beloved Umetaro! As she gets to know him more, she begins to realize that there is someone out there in the world who'll accept her for who she is.

Also contains an extra story:
・10 Nen mo 20 Nen mo (10, 20 Years from Now)

Konashi is a hard-working swimming buff who's focused on becoming good enough to land himself a spot in the upcoming summer swim competition. One day while heading to the pool to swim as always, he spots a guy he's never seen before standing on the jumping board with his clothes and shoes still on.

As it turns out---he's Eguchi, the resident class "mystery" who's only ever attended one of his classes. As they get talking, Konashi realizes he's nothing like the rumours made him out to be---and so began a quirky brief friendship that leaves a strong impression on him even years later.

Even after all these years, you’re still the only one I think of… I’ll put all of my feelings into this letter for you.

A story of a one-track love, desperately wanting to reach its destination.

Kashiyumei, she might appear as a cold and strong girl beautiful girl in the appearance but her heart are opposite of her look. She is the girlfriend of the most attractive boy in her high school, but there is one thing is that he mistreat her by abuse emotionally and physically even those Yumei know that the way he treat her is how he express his love. Yumei, transfer to college. she met a Liang Xiang who is a attractive and all the girls are clinging to him, Xiang dating girl for sex, but until he met Yumei and know about her relationship, is he the one changing yumei love life, or just want to get her for sex?

Yashiro Tenshuu killed 4 people, and is now on death row. However, a secret government organization is willing to take him off death row if he allows himself to become a test subject to an experiment that requires a killer's intent.

Collection of oneshots from 1986 to 1996 by Sugimura Shinichi, including
*Prologue 1 (scanlated)
1. Snow Blind (scanlated)
*Prologue 2 (scanlated)
2. Carnaval 1999
*Prologue 3 (scanlated)
3. Kobayashi-kun (scanlated)
*Prologue 4 (scanlated)
4. OLDK chiku 25 sai
*Prologue 5 (scanlated)
5. BUN BUN BUN
*Prologue 6 (scanlated)
6. Taxi Driver
*Prologue 7 (scanlated)
7. Shoujo Camera (scanlated)
At the beginning of each chapter, there's a humorous prologue with nude-theme.

Another Amagami serialization in Comp Ace magazine. This version features Sakurai Rihoko as the main heroine.

Pastry chef Ishikawa is the object of affection for fellow employee Hashimoto. However, Hashimoto can't seem to find the courage to confess - and Ishikawa has a problem of his own.

1) Don't Show Such a Sweet Face
The morning after a drinking party, Okishima Naoki awakes in a strange bed, in a strange apartment, with a strange woman and a senior co-worker! In addition to that, he can't remember anything that happened...

The story takes place in what seems to be an almost normal 19th century world -- except that two intelligent species appear to be cohabitating, humans and ferrets. We follow the rather brutal arrival of two ferrets airplane adventurers, Andrea and his manservant Elwood, onto an island in the middle of the Amalou river (pronounce Ah-Mah-Loo). There, two small communities of ferrets and humans - or transparents, as they call themselves - live in a forced autarky. Indeed, there appears to be no way off the island... as well as many a mystery waiting to be uncovered. Little do our two gentlemen know that their curiosity will eventually lead them to the edge of the world and beyond, to the Kingdom of the Great Oak where legends take flesh... Now read on!

Three nights during a solitary trip to Italy, the straitlaced Regina spends the night with a dangerous gigolo! She can't believe a smart lawyer like herself would give herself to a man she just met... This is how daringly irresistible this man Nico was to women. Nico seems to be somewhat of a celebrity in his hometown. But Regina doesn't know that he is actually a renowned prince!

From DMP:

Since their parents moved overseas, Toru, Hajime and their little brother Futaba have lived together alone in the Katsuragi house. But then suddenly their problematic cousin Takara arrives!! As he enters the three brothers' lives are in an uproar, for some reason Takara doesn't try to get close to them, and his childhood friend Toru feels unbearably snubbed. When Toru tells him so, Takara quickly shows him a gentle smile, but what kind of dangerous schemes hide behind that expression--!? Palpitation and anticipation under one roof.

Once there was a warrior from the noble class who tried to overthrow the court. He failed and died. His wife was taken and married off to his enemy, and his three sons were fostered in different monasteries. These sons, each gifted in the arts of war, grow up and seek to destroy the men who killed their father. But sibling rivalry and jealousy are more dangerous than the battlefield. The youngest brother, a delicate beauty in the bedroom and a demon on the battlefield is particularly vulnerable. Will he ever find comfort and love, and with who?

Oneshot from Hizamazu Ai ni Kogareru Young chef is in love with the strict maitre'd.