The story is about a Detective named Akiba who crosses paths with a High School Idol named Mizuho. He was assigned to protect her. But he's also a young detective and a bit unorthodox. For the first two volumes Mizuho ends up getting involved in Akiba's other cases but eventually it progresses into a friendship (and eventually a relationship??).

From Royal Alliance:

Sensei, please teach me about love.
Senou Miku is a normal high-school girl. On the day that she had her first boyfriend, her mother had a job transfer. And then, her guardian, who came to live with her, turned out to be her homeroom teacher, Nishizono-sensei...

A cute oneshot about a gyaru chasing her high-school classmate.

The Sweet 18 Ji-eun has been BFF's with her friend next door Min-cheol for more than 10 years. Normally there isn't "just friendship" between boys and girls but they have been claiming that they're just friends for past 10 years... However they come to school together, and gets out of school together, visits each other when each other is sick, and when they go play the both of them goes alone... Will they really be able to remain as just friends like this...? A story far from love~ but closer than just friendship~ Ji-eun and Min-cheol's strange school diary [Balls Friend]!

From Shoujo Crusade:

1. Otona no Shoumei
Tsubaki always appears experienced, but actually, she has never had a boyfriend even though she's already 16, and she's a real baby. She wants to quickly increase her love experiences, and become an adult! One day, she got called out by her math teacher, Shiina-sensei, and she was told that she'll have to take supplementary lessons. All alone in the math room with her sensei after school, Tsubaki's heart beat like crazy when she saw Shiina-sensei's facial expressions that were different from usual...?

2. The Imprisoned Princess
My hard work's finally been paid off! All that studying have invited me to "ouji-sama's" house! I couldn't be more happier! But wait, why do I have to clean his house?!

3. The Prince's Mantle
Continuation of the second story. Ouji-sama and I are now a couple! Many may admire me, but he is indeed not a 'real' ouji. I still love him though...

4. The Upside Down Message
I have always loved my childhood friend. Every valentines day, I send him "chocolate messages". But, he has a harem of girls? Without thinking, I told him I like senpai, but the one I really love is him...

From Lezhin:

Gayoon decides to enroll into a high school far away from home just to be closer to Soha, her middle school heroine and idol. Gayoon finds out about Soha's loss and decides to help her by filling the role of Soha's once true friend - Happy, Soha's pet dog.

Official Webcomic
Official English Translation

From Lovers Dream:

Alone and dumped outside of a love hotel, Mitsuka finds herself caught by the last person she wants to see--her school counselor and teacher, Kaga-sensei! Instead of turning her in, Kaga-sensei wants an interview. It turns out he's an erotic novelist, and he's looking for just the right dose of high school girl reality for his latest work. Kaga makes it clear their relationship is strictly business, but can Mitsuka keep it that way when she's falling for her teacher?

Volume 1 includes extra story: Then, Will You Fall In Love With Me?

Volume 2 includes extra story: Money Makes Being In Love Go Round

This is a side story of the Tough series based around Miyazawa Seiko (Kiichi's father) and his brother Kiryu. Many of the same elements of Tough can be found here, such as mixed martial arts and a lot of violence.

After a mishap with their identification paperwork, two fraternal twin brothers, each living in the north and south of China respectively, are forced to switch homes, schools, and lives! Will the two of them be able to cope?

Official Translation

For the sake of his little sister, a boy tries his best at becoming a star gravure idol.

Tcmanga
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In the Otome no Omocha series:

Vol.1 - Otome no Omocha

Vol.2 - Zoku Otome no Omocha

Vol.3 - Otome no Omocha Sweet

When Brooklyn separated from New York City, it caused havoc on a massive scale. Now, one year later, a mysterious purple figure engulfed in flames has appeared. Who is the Purple Heart and what does his arrival mean for the future of Brooklyn?

Toko is a third-year high-school student who's been active in the ping pong club. One day, the teacher she likes, Katakura-sensei, quit being the ping pong club advisor and went to head the history club. Going to check out the people who 'stole' her precious teacher, Toko finds herself applying to join the history club! The three other members, Ren, Maria, and Naho, might be suspicious of her intentions, but at least she'll be near Katakura-sensei once again!

In the Kokoro series:

Vol.1 - Otokogokoro (A Man's Heart)

1 & 2. Otokogokoro & Otonagokoro
Salary man Saki almost makes it home but passes out from fever just as college student Shinomiya passes by. When Saki comes to he realizes he's in a strange apartment and Shinomiya has been taking care of him for the past two days! Not wanting to be indebted, Saki tries to repay him as thanks but Shinomiya's having nothing of it. Luckily, Saki's pretty creative when coming up with a way to express his gratitude that has them both wanting more...

3-4. Kiss Kiss Kiss

5. Nibukoi (Dull Love)

6. Hiiragi-senpai no Koi no Ohanashi

7. W Pure

Vol.2 - Koibitogokoro (Heart of Lover)

Vol.3 - Koigokoro (Heart of Love)

Vol.4 - Tokimekigokoro (Heart of Excitement)

The number of chapters comprising the main story in each book is as follows:
Otokogokoro (2 chapters),
Koibitogokoro (6 chapters + omake) entire book,
Koigokoro (2 chapters + omake), and
Tokimekigokoro (5 chapters + extras) entire book.

Oneshot that was included in Afternoon’s 2008 Four Seasons Award anthology (v11).

Average, everyday Japanese gameaholic gets sucked into an alternate world where he has summoner powers and life keeps turning out to be like one big video game.

A collection of short stories:

1) Vahlia no Hanamuko
Jiru and Vahlia were engaged. But Jiru suddenly went missing! Four years later, Vahlia was betrothed to his younger brother. During the night of the celebration of her second engagement, Vahlia decides to go on a journey… in search of Jiru!

2) Ryuu no Moriuta
The dragon child Kito and the priestess Shuen await the day Kito becomes the Heavenly Dragon.

3) Ginsekai no Shoumei
Alza lives alone on a desolate snowy plain. One day, Leah, a sorcerer from the magical city collapses near his house. Alza forbids Leah from using magic in his presence and shows her how beautiful life can be outside of the magical world. But, why does Alza hate magic, how did Leah get outside the magical city, and what will happen when Leah returns home?

4) Otogibanashi no Fude
At a far away village, there’s a sacred tree where the Water God dwells. It’s Sasara Yuukei’s task to trace the fading letters of the contract between the Water God and the people of the village. One day, while carrying out his task, he suddenly met the Water God herself! And gradually, he found out that what he’s been doing every day is actually...

From Intercross:

The moment that Rio opens a book that she found by chance, she gets sucked into another world. There she meets a guy that she sees in her dream every night. His name is Tsukishiro. He's a magician who controls the story world, and his mission is to take a "princess" from the outside world there. He asks Rio to be act as the princess and complete the tale "Cinderella", however...

Also contains:
- Burning Heat On My Lips (Kuchibiru ni Tomoru Netsu)
Weak bodied Naruse Momo gets entangled with the reknowned playboy, Toomine Hazuki, at the infirmary.

- In Love with the Wolf (Ouji Tokidoki Ookami)
The theater club will be remaking "Little Red Riding Hood" for the school festival and Enomoto Aria is in charge of the script...

- What Resounds in My Heart Is Your Sound (Mune ni Hibiku wa Kimi no Oto)
That boy keeps playing the song she hates and he won't stop playing it until she can remember the title.

Compilation of short stories:

1) Pet wa Binyanshi.
Shy girl Ruho has a secret. She keeps a cat named Kuro in the garden behind the school. One day while calling Kuro, a bishie answers. "Kuro here...!"
What?!

2) Tenori Life

3) My Boyfriend is a Vampire

4) Sono-saki wa Kindan Ryōiki

5) Tsutsumu Tenohira Sasu Yubisaki

6) Pet wa Binyanshi. Extra Chapter: Handsome Rival.