Pretty Guardian Sailor Moon Short Stories - Volume 1 is the first volume of the short story volumes released along with the shinsōban manga.

Chapters:
Chibiusa's Picture Diary Chapter 1 - Beware of the Transfer Student
Chibiusa's Picture Diary Chapter 2 - Beware of Tanabata
Chibiusa's Picture Diary Chapter 3 - Beware of Cavities
Chapter 1 - The Melancholy of Mako-chan
Chapter 2 - Ami-chan's First Love
Chapter 3 - Rei's and Minako's Girls School Battle?
The Secret Hammer Price Hall

Pretty Guardian Sailor Moon Short Stories - Volume 2 is the second volume of the short story volumes released along with the shinsōban manga.

Chapters:
The Lover of Princess Kaguya
Casablanca Memory
Parallel Sailor Moon

(Source: The Sailor Moon Wiki)