This is not just yaoi mystery stories, it it is the the romantic friendship of Sakaki and Tori, and the caring of Sakaki that rescues Tori and extends his feelings to care for people, especially those who are in trouble or different from other people, sensitive to life in special way, and feeling for beauty in ordinary nature around us. All in understated way. You have to notice at start the blue sky?azure?? egg of the title Sakaki plays with, stands I feel for beautiful delicate shell around and protecting our feelings. I feel the music adds to feeling of delicacy in this drama. You can call this "tearjerker". As it says, if you feel sad and alone, go outside and see the blue sky that connects us all. I wish all people could be so caring. OK, I am sentimental. Perfect. Yokatta!