Kiseki No Koibana

From Intercross:
Sad, painful, and at last, sweet. Please read about these love stories.
There are power stones rumored to give you miraculous powers...One day, Touko accidentally meets a boy, and falls in love with him. She buys a power stone that's said to fulfill her love, hoping that she will meet him again, but...?!

Compilation of short stories:
Kiseki no Koibana
Artistic Devil
Koisuru Karada
My Sweet Dragon
Sweets no Oujisama
Arashi no Oujisama