Sweet Blue Flowers Vol. 2 (manga)

Kyoko’s fiancé invites a group of her friends to join them at his family’s summer home. But the trip ends up including more than just ghost stories and horseback riding—Fumi can now confirm that she has feelings for Akira. And Akira learns more than she wants to about Kyoko’s private life with some accidental eavesdropping. After this, how can the girls just go back to school like nothing happened?