Na Hae-Il, whose father works as a scholar, constantly travels around the world. Hence, it is difficult for Hae-Il to enjoy a regular school life. One day, a mysterious white hair girl appears, claiming that his father sent her! The 14 year-old German girl claims that she is Hae-Il's fiancee and continues to bring Hae-Il into weird situations. Changes in his body, enemies flying at him continuously...
Who are they, and what is hidden within Hae-Il's glove?

The not-so-normal daily lives of a twin brother-sister pair.

From Chocolate Fudge:

Orange is a 15 year old boy who shares a wisecracking friendship with a perky young girl named Kiwi. When the new school term starts in spring, Orange finds himself instantly falling for the smart and attractive Apple. But when the bewitchingly beautiful Lemon shows up, Orange’s heart starts to pull him in both directions at the same time. And as Kiwi worries about what’s becoming of Orange, cracks begin to show in their friendship…

NOTE: In Full Colour

On June 22, 2006, Le Gardenie received third place in Japan's first International Manga Award.

From: Easy Going Scans

They have a plan to replace the whole town with a fake ones from Layers. Will the special class be able to stop them?

From MangaHelpers:

Gaie Kensei is just starting his high-school life, at the same school as his childhood friend Nireki Hikari. His high school boasts a highly competitive kendo club, and Kensei is excited to join and begin learning from the older students. However, the fact that Kensei's father is a legendary kendo competitor works against him. Once the other club members learn that Kensei is not as good as his father, they refuse to let him join the team.

Wandering around in despair, Kensei comes across the secret hideout of Ashihara Naoto. She seems highly skilled in kendo, though she spends all her time reading and claims she hates the sport. Naoto reluctantly helps him train up to prove his worth to the kendo club, though she refuses to join the club herself. On the final day of club sign-ups, Kensei finally makes it into the Kendo club, along with his childhood friend Hikari, who becomes the first female member! Their kendo-centric high-school life is only beginning!

There's a new student at Harukaze High School!
He's a complete ditz, only eats rice, says strange things and is an android built to conquer the world.
Would you believe he's one of the normal students?
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Harukaze High School's photography club is anything but normal. All the oddballs in the school seem to join. And the craziest one has just arrived...an android built to take over the world! Though he'd rather just have a bowl of rice.

Note: Won the 19th Seiun Award for Best Comic (1988).

From Yaoi Is Life:

Utsugi is an investigator working for a detective agency. When he's asked to track the wife of a college professor, Yamashiro, he discovers that she's cheating on him with another professor from the same university named Okuzono Shuji. But this isn't the first time it's happened. Okuzono has stolen away the women Yamashiro loves countless times before. These intellectuals are embroiled in a twisted and convoluted relationship, and now this young investigator finds himself thrown into the mix.

From Minna-scan:

This is a story about a Kuu, who is thinking about her prince all the time, she has dreams of him all the time, of him telling her to come with him. One day, as she goes back to school, she meets with someone who looks like him. Before long, the story gets complicated with mechas and stuff--what will become of Kuu?

After spending his entire life in all-male schools till high school, Mingu finally enters college. Making things more exciting is the fact that he's in the Food and Nutrition Department with a male to female ratio of 1 to 9! A virgin and single since birth, this is his opportunity to date girls and enjoy a romantic campus life. But one wrong lie during a drinking party turns his life upside down and now he's been branded as a sex beast all over the school!

Nene, Hajime and Ryou have been friends from their childhood. Now in high school, they spend their days practicing for the school's marching band. But the club, lacking members, is about to close down.

And Nene, who wavers between sarcastic Hajime and brother-like Ryou, must decide between the two...

From Shinnen:

Tachibana Itsuka has always planned to live on her own once she became a high school student. On the day she's supposed to move into an apartment building, she finds it burnt and unfit for living. She's forced to live in the house of the landlady's son, along with two other women, and starting day one, none of them get along at all.

Includes oneshot;
Pure Heart Broken - To Rise to the House's Drama

Whenever Tomo gets a girlfriend, his selfish childhood friend Hideaki comes between them. Now that Tomo has a new girlfriend, he's on the lookout, but nothing happens. Thinking the lack of intervention strange, Tomo then discovers that Hideaki has a new lover—a man! Maybe he was just showing off, but Tomo can't forget how gentle his friend looked when he was worrying about love.

A straight guy easily moved by kindness and affection and an egotistical hottie with a strong desire to monopolize. They can't go back to the time when they thought they knew everything—a romance blossoms between friends.

Takeru, who just graduated from middle school, learns that his father has suddenly remarried. While being happy for him, Takeru leads, what he believes to be a boring life. His only hobby is taking pictures of things he finds 'nice' with his cell phone. Upon entering high school, he is taking pictures of some cherry blossoms, when he sees a strange foreign girl and accidentally snaps a picture of her. And thus begins Takeru's interesting new high-school life.

A oneshot by the author of Bitter Change, Masayoshi, comes a story of forbidden love between a teacher x student and a student x teacher

Yonezo Yonekura is a young student, who is just starting to mature and notice his old childhood friend Tomoyo. Unfortunately for him, Tomoyo only likes intelligent people, and let’s just say Yonezo isn’t the brightest crayon in the box. One day when walking home, a strange old man warns Yonezo not to touch a demonic book that he will come across on his way home from school, but when Yonezo sees the book, he is too curious and picks it up anyways...

Follow Eugene's "normal" everyday life. This comic is serialized in Gempak comic magazine from Malaysia.

Gyul, the outcast of the entire school, who used to be unable to get away from dangers without Ri Rang's help becomes strong with a sword obtained at an antique shop?!

Hot-tempered, unruly fighter Woo Ri and my best friend Gyul suddenly seems different? My heart beats when I see Gyul! Without knowing my eyes turned to look at his lips, and I could feel myself blushing. This is not a disease, is it?

Based on DS Dating Sim "Love Plus".

This series of stories started as just the oneshot Pure Love Strip, and then Doting Love Strip and Lavish Love Strip were released.

From ShoujoMagic:

Pure Love Strip
Yuuko is in her third year in Junior High (freshman in high school in US). She is a glasses wearing...four eyed nerd. She's suddenly getting tutoring from perfect Ryuunosuke-kun, but that is not the only thing that Yuuko is getting tutoring for...Yuuko's dangerous summer hoilday is about to begin!

Doting Love Strip
The continuing story after Pure Love Strip. After their first time.. he has started wanting it... every day!?

Lavish Love Strip
The continuing story after Pure Love Strip and Doting Love Strip. Perhaps the smuttiest installment so far? Yagami is tutoring Yuuko so that they can be in the same High School... But is his need for a wild sex life going to interfere with Yuuko's studies??