The bird who fell in love with the sea

Kotori Minami is a 2nd yr. high school student in Otonokizaka Gakuen. She fell in love with her childhood bestfriend Umi Sonoda. She always gets flustered around her. How will she hide her feelings so that Umi will not find it out? What if Umi accidentally find it out? How can her feelings affect their friendship? Sor...