Info from (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