Yuina and Maya have been friends since kindergarten. They both like each other, but...?

Note: The main story has 61 chapters, but the book includes 3 other short stories inside it.
Kamai Kamaware Yuri Shimai (12 chapters)
Ano Futari to Yuri Shimai (5 chapters)
Chiisana Yuri no Hanashi (15 chapters)