There's a rumor that high school freshman Aki is involved with Masaya, a candidate for student body president next term. Aki thinks of Masaya just as her best friend, but to make sure of the matter, Masaya's younger twin brother Naoya appears! Aki begins to be seduced by Naoya's forceful manner...

Then one day, Masaya collapses. When Aki goes to wish him well, she's relieved to see that he's okay. While she's there, though, Naoya asks her out on a date, and he's being much gentler with her than usual. Aki musters up her courage and tries to tell Naoya how she feels, but not only does Naoya do an about-face and command Aki to date Masaya instead, but another girl confesses love to Naoya right in front of her!? What's Aki going to do...??

-- ShoujoMagic

Mizuki is the female “prince” of her all-girls school and the lead guitarist in an all-girl rock band. Akira is the male “princess” of his all-boys school and wants to join her band. Love may be on his mind, but romance is difficult when everyone keeps mistaking Mizuki for a boy and Akira for a girl!
When the lead singer of Blaue Rosen announces she is moving overseas, Akira does all he can to convince Mizuki and her bandmates to let him join. But will a resistant Mizuki allow him into her band, much less her heart?
(Source: Viz)

From JShoujo:
It’s a story about a girl who lost her every memory. One stormy night a sudden meeting changes her life forever. She starts anew while still trying to set the pieces of the puzzle that was once her life. Soon after, a love that puts everything on a line is born in the girl’s heart.

[Taken from ShoujoMagic] :

A collection of Shinjo Mayu's earlier (and less smutty) short romance stories.

1) Bare the Heart (Kokoro wo Hadaka ni Shite). Mina is a high school freshman with a crush on her math teacher...who also happens to be her cousin Yukiya! Mina has always been very precious to Yukiya, and at times it seems like he can see straight through to her heart, but can he ever see her as a woman and not just his cute little cousin? How long can Mina's flirtations go unnoticed by Yukiya (or by the sadistic and lascivious chemistry teacher, for that matter)?

2) A Vampire at My Neck (Kubisuji ni Banpaia). Be careful when you go groping in the dark...you might just find a vampire! That's what happens to Hitomi. Now she's attracted to Kairi despite what he is. Or is it because of what he is? Kairi has a powerful charm...but is he too charming? Dangerously charming?

3) Hold Me, Melt Me (Dakishimete Tokashite) Ryou is a high school sprinter who's racing for a different kind of goal--his pretty track manager, Airi! He says he wants chocolate from her on Valentine's Day, but...is that a delicious metaphor for something sweeter? Whatever the case, it melts in the mouth!

4) Examine Me Gently (Yasashiku Mite ne). Sanae just had her appendix removed. But while she waits in post-op for her surgery wound to heal, she starts to develop another malady--love sickness! And her handsome new attending physician, Dr. Touya, is the cause! What can cure Sanae's ailment? ...A sponge bath, maybe?

Omake: If you have ever wondered why Shinjo Mayu's female characters have such big breasts and why her heroines seem so young...then you must read this omake! It is a great insight into the mind of Shinjo Mayu!

Aine never wanted to be a writer; she just created some erotic song lyrics for the sake of entering a contest. When she bumps into a man she doesn't know and looses the lyrics, she thinks she'll never see them again, but she thought wrong! He turns out to be Sakuya, a famous rock vocalist known for his sexy persona and lyrics. When he invites Aine to be his new lyricist, she finds herself quickly sucked into the harsh world of showbiz... and the even harsher world of falling in love with a guy that millions of girls love just as much!

A collection of steamy short stories by Shinjo Mayu, three of them published in a volumized form for the first time.

1) Teach Me More (Motto Oshiete), was released in the anthology Yuuwaku - Sakaraenai Yokubou (first story).

2) A Boy's Suggestion (Shounen no Susume) was released in the anthology 17-sai Hajimete no H (first story).

3) Lewd Melody, Obscene Fingers (Midara na Senritsu, Hiwai na Yubisaki). Published also as first story of Love & Sex : Yurika has grown so used to doing what others tell her to do that she never realized she was like a caged bird. She accepted it as a matter of course when arrangements were made for her to get engaged to Satoshi, her controlling piano teacher. That is until piano genius and fringe element Hibiki teaches Yurika how to put emotion in her music -- how to fly from her cage -- among other less innocent things...

4) Teach Me More - Side Story : Teach Me More & More - How the Wolf Feels - (Motto Oshiete - Bangaihen : Motto Motto Oshiete - Ookami no Kimochi) - Continuation of Teach Me More. Hina and Kyousuke finally go on their first real date, and we learn how the wolf feels about his rabbit...

5) Haou Airen Side Story - A Tale of Happier Times (Haou Airen - Bangaihen) Kurumi's brief dream of happier times with Hakuron.

Fianse Shitai Yukimi is a high school junior and cheerleader already scheduled for her first marriage interview. She's seen a disappointing picture of her nerdy potential groom -- and he has such a weird name -- so Yukimi has every intention of rejecting him, but she's still curious to go and see what a marriage interview is like. Later that day, Yukimi meets her ideal man at a football match and inadvertantly begins cheering only for him -- despite the fact that he's the opposing team's quarterback! He gives her a bold and seductive response. Ah, if only Yukimi's marriage interview could be with a guy like this... But why won't the sexy quarterback tell Yukimi his name...? (taken from shoujomagic)

Renjouji Kiriya holds the coveted position of the number 1 ranked host at a high-class host club "Chateau de l'Amour" in Tokyo. The Chateau de l'Amour specializes in providing the company of beautiful, cultured men to female customers. Few people know that the popular Kiriya is actually Yamada Kotarou, a boy from Nagasaki who came to Tokyo to find a way to repay his parent's debt.

Some of the other hosts, jealous of his position, are determined to get past his perfect facade to discredit him. Kiriya will have a hard time stopping them, especially after a former customer dumps an adorable 5-year-old girl on him, claiming he is the father. The only thing that could make this situation more difficult would be the arrival of his Nagasaki girlfriend Miharu, who knows nothing of his career as a host...

Math teacher mamiya nagisa is teased by his horny students at an all boys high school on a daily basis. One day genius high school student, sakura minato, transfers from America. Minato jumps in to save nagisa who is teased by the students, but is told, "i want to sleep with you." When he asks senior teacher tsukioka for advice, he is attacked by him. What will become of nagisa's purity?

Miko is a shrine maiden who has never had much success at seeing or banishing spirits. Then she meets Kagura, a sexy demon who feeds off women’s feelings of passion and love. Kagura’s insatiable appetite has left many girls at school brokenhearted, so Miko casts a spell to seal his powers. Surprisingly the spell works—sort of—but now Kagura is after her!
(Source: Viz)

Miu Sakurai, age 15, attends a Catholic school where she prays every day for her admired Shion Amamiya to return her love. When that doesn't work, she places her faith in a book of magic and tries casting one of its spells. However, it's not love that manifests... it's Satan! "The recompense for the contract to grant your wish is your virginity," he tells her, and this is Miu's virgin crisis!
(Source: ShoujoMagic)Included one-shots:
Volume 4: Satanic Honey and Satanic Cohabitation

Misaki has dreamed to be had by Michiru, so much that she would die for it. Knowing that he is a player, she goes to find/meet him at a bar. She gets had by Michiru. But after that, is it over? Or will he still remember her?
"The beautiful and most mysterious poison 'flower'...is tempting every part of me..." Misaki loved him from the bottom of her heart... because she loved him... and longed for him... but now Misaki is slowly losing hold of Michiru...!?

A kind hearted guy who grows up eating apples and whose parents own an tartlet cafe, wants to be the ultimate gang leader. A villainous girl who was brought up in a family of gangsters wants to be the owner of a tartlet shop! How will the pair cross one another's path with their dreams on the opposite party?

[From ShoujoMagic]:
Juuna's uncle gets her to enroll in the school where he's principal. The only problem is that it's an all boys school! With all those rabid guys around, Juuna needs someone to protect her. In comes Shibuki to be her bodyguard...but Juuna wants him to do more to her body than just guard it!

Himeno's chest will hurt if any boy touches her because she has the diamond of the heart. However, when she was young, she befriended two boys -- the gentle Mamoru and the blunt Keigo -- who are able to touch her without harming her. Without knowing about the diamond of the heart, both Mamoru and Keigo promised to protect Himeno. When some people threaten to take Himeno's heart, who else will protect her but her knights?
(Source: MU)

From Shoujo Manga Maniac:
Ruka's a junior high student in love with her father's assistant, Fumi-sempai. She wants to become an adult quickly because everyone sees her as a little kid! But what would happen if she actually became an adult with the help of a time machine?

The summer of a seventeen-year-old girl. Since her female friends backed out at the last minute, Mai ends up going on a trip with 3 boys. What's more, it is her first time meeting them!! This... this might be...!?

From ShoujoMagic:

This book is a collection of steamy stories!

Story 1) I Want to Be Bound by You
Ayuna comes to visit her brother at the hotel where he works, but a case of mistaken identity leads her into the royal suite and the arms of Takano, a handsome young businessman. He's Daidou Corporation's ruthless behind-the-scenes manipulator who handles all of its dirty work. Nothing gives him more pleasure than corrupting that which is pure, and... Ayuna is pure.

Story 2) Steal My Body Away/ Your Heart, Your Person
Terumi and Kazu have been sleeping together at hotels, but the relationship is entirely physical. Can it be called love? This is when Terumi suddenly meets Kyuuji, an intense young stranger who boldly uses her to escape a fight. Because she takes offense, Kyuuji then pursues the fight to appease her. He steals Terumi's heart away, but will the jilted Kazu allow Kyuuji to steal Terumi's body?

Story 3) The Devil's Mask
Natsuki is content in her relationship with Showa, a boy in her tennis club. That's why she despises herself for drinking too much at a party one night and sleeping with the student body president, Kazuomi. He's a devil and a genius who publicly wears an angel's mask, and he tells Natsuki that if she doesn't want her boyfriend to know about her drunken infidelity, then she'll continue sleeping with him in secret. The secret is in danger of being exposed, however, when Kazuomi joins the tennis club. No, not that secret -- Natsuki's OTHER secret.

Story 4) Painful Love
Everyone is a little afraid of Ryuuichirou. He's a gang leader who hangs out in an alley that Norika passes through each day to get to work. Norika is attracted to his dangerous aura and the gentility he displays towards her, but a painful past haunts him that has the potential to be both spiritually and physically painful to Norika.