A rumored girl seems that she can't graduate unless she takes extra classes and also pass the examination test with a 60. She thinks that there's nothing to do in the school, but while studying....she finds....

This extra story can be also be found in the manga, Chocolate Christmas.

1. Miss Rain
2. Boku no Pierce Girl
3. July Marmalade Birthday
4. Maigo no Swing
5. Itsumo Issho ne♥

Parody manga of Bishoujo Senshi Sailor Moon by Azuma Kiyohiko.

From Aku-Tenshi :

Because her father was sent to London to work, Natsumi, a 4th grade student, also must leave Japan along with him. Her classmates throw a farewell party for her. Natsumi is prepared to go to London, but on the night before Natsumi's arranged departure, a baby suddenly appears in her house after a roar of thunder! What's more is that this little baby is actually the one that Natsumi will give birth to in fifteen years!

Tsubomi is a prince of flowers and also the general of the army that protects the flower spirits. But he drank and smoked and was so disruptive that his mother the queen kicked him out of Tenkai (heaven land) to earth. Kaoru, in charge of Tsubomi's education, followed him, but Tsubomi finds trouble wherever he goes...

A one-shot taking place after the Captain Tsubasa manga and before the manga World Youth. Tsubasa isn't in Japan anymore, the High school national championship is ending, and Japan's players will make three friendly matches against the Hollanda Youth.

15-year-old Goro Inagaki has just graduated from middle school. Blowing his last chance to confess to the girl he loves, Shiina Fujitani, he gets depressed and contemplates suicide. But just as he comes to his senses and decides life is worth living, his slips, hits his head, and dies anyway.

However, it turns out his number wasn't meant to be up. Due to a clerical error in heaven, Goro died instead of another man with the same name. But when the angels try to fix this, another mistake lands Goro in the wrong body: a beautiful young girl the same age as him, a well-to-do millionaire's daughter, Hitomi Kusanagi, who also just so happens to go to the same high school as Shiina. What's more, Hitomi wants her own body back, and won't let Goro ruin her chances or her reputation.

1. In "A Can of Happiness", Emi wins the special prize in a raffle, which turns out to be a can that supposedly holds happiness. There's even a weird little man who starts following her around, claiming he's the "god of the can" and trying to give her advice. But all she wants is for her relationship with her boyfriend to feel less like a one-sided crush. Will this can really help her be happy?

2. Because of the annual health day at school, Shinako finds out that she's 4 kg heavier than her crush, Nagase. How will she handle this and what will happen if Nagase ever finds out? Is it true that "Boys Just Don't Understand"?

3. High jumper Kito from "A Million Words" is one year older than her boyfriend Kawai - a fact that his classmates seem not to approve of. She feels pressured to live up to the image of being grown-up, so that Kawai won't be disillusioned. This relationship is bound to end in tears - or is it?

4. The proud tsundere Matsuda has been in love with happy-go-lucky Tsumura for ages, but she just can't tell him. Aggressiveness is her heart's only defence when she's near him - after all: "The Opposite of Love is Hate". Tsumura has never minded before, so what will happen when that changes?

5. Kawamura and Tanaka are going out now, although Kawamura thinks Tanaka is a bit scary, and it's actually Kondo-sempai who likes Tanaka. What went wrong? And why did Tanaka agree to go out with Kawamura in the first place? You'll find out in "I'll Always Be Here".

A collection of short stories.

I. Tody.
II. The Last Bus.
III. Family.
IV. Evil Spirit.
V. Inviting Darkness. Also called Soshite Yami wa Yomigaeru/And the Darkness Will Return/Coming Dark.

Raised by her single father, Gin-chan, Sengoku Kingyo, spends her days helping run her dad's takoyaki stand, while attending night school at a local high school. One day, she finds a guy her age, named Teshigawara Itaru, passed out near a pile of trash and rescues him. Homeless and without anyone to take care of him, he is taken in by Gin-chan. So starts a comedic whirlwind of a story about school life, love, and family.

Taken from PRISMS:

The sexual adventures of a number of characters in this series accumulate into mayhem when they all finally meet together: two hermaphrodites, a very special twin, an unlucky girl and a devil who is double gifted.

From Omanga:

A Sci-Fi story in which the world as we know it is just a fragment of the past. By the writer of MPD Psycho, Leviathan, Brothers, and Madara, Japan delves into several interesting topics, such as the importance of genealogy and history, in an enjoyable fashion.

Tamu's Everything Capsule #8 (12 volumes of Tamura Yumi's short works)

This is volume 3 of the "Riyuu" series (Capsules #4, 7-10, and 12), which contains standalone episodes featuring the boy Ryuuzaburou and his humorous family life.

From Tokyopop:

To experience true love, sometimes you have to break the rules. Taku is a total player and a sometime-gigolo who has a little black book a mile thick . But when he meets a shy girl named Chizu who falls head over heels for him, he tries his hardest to change his playboy ways. This poignant volume from Sakurazawa-san depicts Taku and Chizu's bittersweet summer of love.

The story revolves around a high school student named Shinya Matsumoto and his love story, which takes place in the summer vacation. Shinya unexpectedly encounters a car accident, which results in a mother and son being taken to a hospital. The son, Daisuke Kirishima, is completely fine while his mother, Reiko Kirishima must stay in the hospital for three weeks and is unable to look after her son thereafter.

Collection of stories:

1. Rakka (落下)

2. Aibeya (相部屋)

3. Ryokan (旅館)

4. Nunosei Kyoushi (布製教師)

5. Oshikiri Idan: Kabe (押切異談・壁)

Son Goku and Usagi Kozou were the two of the most feared creatures in the Underworld for their strength and ruthlessness. They ruled all the creatures in the Underworld through brute force and magic, wreaking havoc on the Surface World almost as an afterthought.
The Heavens banished them by trapping each of them inside a boulder; 500 years since then, there still had been no word of them. But then, a female monk on a mission to warn the king of the Surface World of an approaching grave danger enlists the help of Son Goku and destroys the boulder binding him. Around the same time, a girl named Eilin, a martial artist in training, happens to be passing by Usagi Kozou and unintentionally frees him from the boulder. Eilin has a dark secret: she was born from a dragon god impregnating a human woman. Because of this heritage, Eilin has a dragon tattoo on her body.

Through strange turns of events, Son Goku, Usagi Kozou and Eilin are required to deliver the monk’s message to the Surface World’s capital, Tenjiku, even though a powerful, dark aura is surrounding the city. What is this dark energy that not even the powerful Heavenly Beings can break or even see through? What does Eilin’s connection to a dragon god mean for their adventure?

A series of short stories centering on Sugekoma, a high school prodigy with severe behavioural problems, and Miss Matsuzawa, the teacher who he ties up all the time. It's a big send-up of S/M cliches, H manga, SF, and the otaku mentality.

There are minor subplots concerning other students - e.g. Junko Fujieda, who can't stand perverts, they make her violent; and Murata, a masochist who's infatuated with her.