Shirakawa Hotaru, a girl in love with Inami Ken, finally confesses her feelings. From that point on, they were a happy couple, until one summer. Ken meets a new friend, Tobise Tomoe, who is Hotaru's best friend. Tomoe seems to have her own charm. Ken now has two paths to choose from: to be with Shirakawa Hotaru or Tobise Tomoe. Otherwise, he will lose them both.