From Anime Waves:
Nakabaru Taiyo came to Okinawa in the pursuit of beautiful ladies and the blue sea... But while trying to hit on a cute girl, she told him that her mother hated him... And then a wonderful story of scuba diving, beautiful women and adventure begins!

So you're a high-school student and love your teacher. Why? Well, big boobs, nice ass, etc. However, your “sister” loves you. Almost seems like a story with no end. Problems arise as expected and such, but what if your teacher that you love and your sister’s soul interchanged and switched bodies. Which one will you love now?

1-3) Inu Jikan
Riku is a girl who would choose dogs over a boyfriend and food. And it just so happens that the most popular boy in school not only has the word "dog" in his name but owns three large dogs too! Will love bloom?

4) Amakuchi Kigokoro

5) Himitsu no Chikara

From Bamboo Garden :
Hui-Jin and Young-Ho's parents get married to each other, and they start to live like family when Young-Ho falls in love with Hui-Jin.... Will the family last?

From Osuwari Team:

"In our classroom, everyone has worries behind their smiles. Parents divorcing, complexes, kissing… The main characters in these stories are living with pain or anxiety, but they are still shining brilliantly."

A short story collection of Jirô Matsumoto's, things get nasty, and wet. Seriously, in each of those stories there's enough body fluid sloshing about to fill a swimming pool.

Mio Keisuke is a high-schooler who leads a rather dull, boring life. He can’t keep a girlfriend—because being a kept man’s too much of a hassle, and he can’t bring himself to fall in love and want to please his woman. Then—one day he seeks shelter from a sudden downpour under the awning of an apartment owned by Yugi Kakeru… and suddenly his life isn’t so dull anymore as he finds himself falling for his aloof and yet obviously lonely friend.

Comes with an extra for Kimi Note.
Includes characters from Star-like Words.

From Clockwork Lies:

The girl that the protagonist is in love with was attacked by a rapist. However, the protagonist couldn't save the girl and even lost his own life in the struggle. He found himself in the hospital of hades (the other world) after his death and met a strange doctor in that place. The doctor made an offer to him. He will be given a chance to revive and return to the human world if he makes a contract with the doctor... What will he choose, and what exactly is this contract?

A student-teacher romance.

• Summer Window Syndrome
Why doesn't Nanao want the school doctor to call her by her first name?
• On My Tiptoes in October
Nanao sees a different side of Matsumoto.
• First Love Canon
Another teacher gives Matsumoto and Nanao some advice.
• Liars' Engagement Part A + B
In the first half of "Liars' Engagement," Nanao and Matsumoto disagree over Nanao's plans for her future. In the second half, Nanao confronts Matsumoto.
• Lovesick Over My Best Friend
Focuses on two side characters.
• Chatting in Our Pajamas
Kiyo is in love with her friend Nanao, but knows that Nanao is already with someone else.
• Bursting with Impatience
Focuses on Matsumoto's feelings.

Extras:

• Summer Window Chatting at Night
• Summer Nude
• Prologue: Hidden Name
• Mental Age Limits
• Hatsumoude Syndrome
• First Time
• After Start

Taku, the boy with a black cat. He uses medicine that cannot be obtained through ordinary means. He is a self-proclaimed Kusuri-ya.

From Echochi:

Blockheads Kasukabe and Misato are always quarreling over everything. But one day, Kasukabe finds himself helping Misato to escape from a bunch of fangirls. Alone in the classroom. Kasukabe starts taunting and teasing his arch enemy. But somehow, things start taking a turn towards a completely unexpected direction…

From Storm in Heaven:

Tamiya, a student whose honesty tends to be so blunt that it gets him in trouble, has fallen in love with Shirasaka, a teacher from his school. He's an excellent teacher, very caring and popular among students, but because of his dark past, there seems no hope for Tamiya to win over his heart. In the past, Shirasaka had a relationship with Iogi, his senior on the track team, and they were both in an accident which was Shirasaka's fault. Iogi became seriously injured and was forced to give up his athletic dreams. Since then Iogi has used Shirasaka's guilt to keep him close. Is there any chance for Shirasaka and Tamiya to be together?

From Stiletto Heels:

While suffering from a broken heart, Sera moves in with her parents in their home in the countryside. Although Sera swore not to "get into a relationship for awhile" she meets Saji, a station attendant, and falls in love once again...?!

Keigo Satou has a crush on his classmate/friend, Arai, who is always cheerful. He tries to make her fall in love with him even though she doesn't notice him.

Manager Nashizaki Tatsuya of the Pianissimo Club, wants to build the biggest hostess club in all of Japan; a club where men of all ages and nationalities would want to go. And, along with his big club, a huge event will take place, a contest for the number one hostess, with a prize of 100 million yen. Aya, a freshman, doesn't like the idea of being a hostess, but she has to become one, due to a big debt her parents owe. Encouraged by a friend, she reluctantly joins Pianissimo and, so, her life as a hostess begins.

Teshigawara Saki is a high school girl who lives in Roppongi with her perverted father and grandfather. Though she may seem like an ordinary girl, she has the extraordinary ability to open any kind of lock. Saki uses this ability for whoever asks, regardless of whether they are the police or yakuza. But with the organized crime situation worsening in Roppongi, this openness may end up getting Saki more involved than she would like...

Welcome to the anti-underwear naked club. You're invited to join Hanako Tanaka in her quest to rid the world of underwear. Her cohorts are Akiko Yamada (A cup), and Mariko Watanabe (F-cup). Together with Hanako's male childhood friend (much to his chagrin) they strive to make a world free of undergarments....Or so they try.

N/A

Kokubo Masahiko is normal Junior High School student, but because of his bad grades he gets a home tutor known by the name of Hamanaka Ai. With help from her senpai Nakamura Ryoko, she goes about her days being a home tutor to a young boy bringing perversion and misunderstandings along with it.

The Queen Knights are the appointed protectors of the queen (self-explanatory) and there is this dirty little village kid who fell in love with the princess and wants to be one. it would be a typical shounen story, but there is a dragon that wears sunglasses. Therefore, it is awesome.