Info from here (and there's lot more info about the two volumes there):

This is a collection of manga short stories done by Takeuchi Naoko, from her debut in 1986 through her first work after the completion of Sailor Moon in 1997.

V.1
• Gradation 1: Tamaki - Peppermint
• Gradation 2: Saura - Sunset
• Gradation 3: Mizuki - Moonglow
• Gomen ne Wednesday (Sorry Wednesday)
• Liner Notes

V.2
• Rain Kiss
• Yumemiru Rainy Button
• Secret na Kataomoi
• Love Call
• Yume ja nai no ne

From Digital-Wing.com:

In the December 1998 issue of manga magazine Young You, Naoko returned from her yearlong break from work with a new series: Princess Takeuchi Naoko's Return-to-Society Punch!!. This "private essay comic" is a silly narrative in manga form about the events in her life." After her post-fame with Sailormoon...this is Naoko's return.

When Mimii was young, she was friends with Hoshiko. Hoshiko had to go to the United States because she was studying abroad. Mimii makes Hoshiko promise that they will always be friends. And this is where the story starts.

Meca shows up in Mimii's life 7 years later to become her friend, and to help her. However, Meca isn't exactly all that Mimii thought she would be. Meca keeps getting into trouble, saving people's lives, and summoning various people/robots/objects with her cellphone.

From StarryHeaven:
The story about a girl named Chieri (nicknamed “Cherry”) who began ice skating ever since she saw the handsome ice skating champion Tsuzuki Masanori skate. She pursues her dream of being Tsuzki’s partner, all the while facing her rival, ‘Princess’ Canty. With the help of her friends, and her own courage, can Cherry win the heart of the boy she loves so much…?

From StarryHeaven:

Maria is a girl attending a Christian private school. Her mother is sick and in the hospital, her family poor. They live off the money of a man whose identity is unknown to Maria. He is called “Daddy Long-Legs” and he supports Maria and her mother with only one fee: Maria becoming his bride. Just who is this mysterious man? Is it the doctor? Someone she does not know? A boy from school…?

Like Sailor Moon, Minako Aino is a normal 13-year-old schoolgirl until a fateful day when a white cat introduces himself to her and tells her she has the power to transform into the hero, Sailor V. Using a magic pen to transform, Sailor V fights the evil agents of the Dark Agency as she strives to protect the earth.

Usagi Tsukino is a normal girl until she meets up with Luna a talking cat who tells her that she is Sailor Moon. As Sailor Moon Usagi must fight evils and enforce justice in the name of the Moon and the mysterious Moon Princess. She meets other girls destined to be Sailor Senshi (Sailor Scouts) and together they fight the forces of evil.

Note: Naoko Takeuchi released a re-illustrated version starting in 2003 after she had dropped Love Witch. This new edition had new cover art and title logo as well as slight corrections to dialogue and the artwork.
Won the Kodansha Manga Award for shōjo in 1993.

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

From StarryHeaven:
Peanut and Kyuuri are aliens who have just arrived on planet earth. Their mission? Find their missing queen! However, this is not easy considering how they have some evil menace pursuing them and the fact that they turn into cockroaches and can’t turn back without kissing a human male! They also have a lot to learn about the new planet they’re on, so it’s a bit difficult when they have to fight evil…

There are only four chapters that were ever published in this series, as Naoko dropped this project due to Kodansha losing her original manuscript.

Ryouko has fallen in love with the radio DJ Choco. Upon sending him a cake for Christmas she finds herself as a substitute in the radio show. Will she be able to get closer to Choco? But then there is also her annoying school mate, Keiki...

Includes short story: Wink Rain.