A collection of four short stories by Fuyumi Souryou.

The Rainbow Fish is a story about a painter and her problems dealing with a culture that doesn't leave too much space for artistic inspiration. From a little girl to adulthood, Sari struggles to show how she sees life through her eyes. This story is something of an autobiography.

Damned Sun is about a cynical girl who isn't very enthusiastic about most things teenagers like. She meets a man, a funny, interesting gangster. They get along very well from the beginning, understanding each other without too many words... But it only lasts one day, since what shakes Maki from her apathy can't last long...

Strange Trait asks the question: Are human beings are like groceries? Do they really have a certain durability? A writer thinks so, and she bases her novel on the idea.

A Strange Gene is about Ayano Yoshimusa; a superb worker, efficient, accurate, and cold. Saegusa, her colleague, is her opposite: messy, chaotic and warm. He admires his boss, whenever he talks to her he realises what a perfect creature she is… But as always, not everything is what it seems. When a sixteen years old appears and tells him she lives with Ayano, Saegusa seems to perceive that something might be hidden under the perfect appearance of this beautiful woman…

A collection of oneshots:

- Cactus (Saboten)

- Pecan Pie

- Lunar Eclipse

- Fading Afternoon (Afternoon will fade)

- And Sweet Feeling

- Him at 45゜

Kira believes that Rei and all other men in the world are dirty. She stays away from her classmates, hiding in her art. What happens when the delinquent motorcyclist and playboy, Rei, gets a hold of one of her drawings, and actually wants to keep it?

From MegKF:
This one volume manga is another great series by the author of Mars!!
Doll is about a girl who decides to try out for a Broadway play!! On her way to the audition she gets hit by a man who is one of the top ballet dancers in New York, who just happens to be the lead in that very play.

Based on exhaustive research in collaboration with a Dante scholar, Souryo brings Cesare Borgia, one of the most enigmatic figures in history, to life in vivid detail. Bookish and naive, Angelo da Canossa is unprepared for life as a student in a university that hums with tension and intrigue in Renaissance Italy. Will his innocence remain intact when a chance encounter with the charismatic Cesare draws him ever deeper into the darker side of the Renaissance? (Source: Manganews.net)

"Mars Gaiden" it's a collection of three stories by Fuyumi Souryo.
The first, "Namae no nai uma", it's a "Mars" prequel telling the first meeting between Rei and Tatsuya and the beginning of their friendships. Moreover, they're also presented other main characters as Kira and Harumi.
The second and the third stories, "Nemuru Raion" and "1 Karatto no Kajitsu", are oneshots not related to "Mars".
The first tells the strange relationship between Isomu, a guy who pretends to don't have any fear, and Ayame, a girl with particular behaviours; at the contrary, the second tells about Nina, who has some family's problems, and Rui, her classmate who is interested in a close friends of the girl. But what if he's interested in Nina?

Oba Tamako tells of her time being at art high school.

Ryousuke Akiba calls himself ES, a code name taken from a mysterious scientific experiment. Ryousuke will live to be at least two centuries old and possesses strange mental powers: He can enter people's minds, discover their darkest secrets, even rearrange their memories so that complete strangers will treat him like family. Ryousuke acts not out of malice but for survival-wandering Tokyo for reasons known only to him. No one recognizes him for what he is . . . until Dr. Mine Kujyou, a determined researcher, meets someone who challenges everything she knows about science- ES, possessor of the Eternal Sabbath gene. But is he the only one?

Tome dreams of becoming a famous fashion designer. She's on the right track, working for some big-shots, and then Tamara gets dumped on her. While Tamara may be a famous beauty on the run-way, in her normal, daily life, the supermodel is self-centered, obnoxious, bossy, and an utter leech. However, when the bearer of a "cursed" necklace dies at a fashion show, is Tamara the only help Tome will get to solve the mystery?

From Storm in Heaven:
Takatou Masaki is the second youngest of four sons, and seemingly a delinquent by nature. His hot temper has put a wedge between himself and his strict father, gotten him kicked out of one school, and tossed him at a school notoriously horrible for the one thing he's truly good at, basketball. A chance encounter with the willful Yuuki Kanako may serve as a catalyst for change, as the indefinable connection she feels with him draws them together...
Won Shogakukan Manga Award in 1988.