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The series focuses on the forbidden love between the Angel Rin and the Human Miku Crynpto, who aren't allowed to be together because love between and angel and human is forbidden. Knowing this, Rin meets with a demon and exchanges one of her wings to become a human male.
The angel Rin has fallen in love with the human Miku Crynpto. She knows they can never be together because love between an angel and a human is forbidden. Rin trades one of her wings to transform into a human male. With her new body, she takes the name Len and seduces Miku. However Kaito has come to punish Miku for an unspecified crime and kills her. Rin finds Miku's corpse and trades her other wing to resurrect Miku, but dies as a result. In the end, Rin narrates that once Miku's feelings for her die away, she can return to life.
This song tells the story from Miku's point of view. She knows that she had pushed away the person she loved the most, yet she couldn't remember who that was. On the day of her wedding, she meets a man named Len and runs away with him. Although she loves Len, she feels that it isn't right and it hurts her. Later Miku is shot by Kaito and when Rin trades her wing for Miku's life, she recalls who Rin was, but it's too late as without her wings, Rin dies. Although heartbroken by her lover's death, Miku believes that if she keeps loving Rin, they can see eachother again.
This song tells of the war that took place over a thousand years ago. Kaito, the angel queen Lily and and a green haired angel (Mikuo) fought a demon and banished him to the earth. However after the battle, the green haired angel and Lily vanished, presumably falling to earth themselves.
A novelized version was published on September 24, 2012, with much more characters. A book signing was also available with Hitoshizuku-P and Suzunosuke attending on September 29. A book trailer can be seen here.
The story structure of the novel is set up with a prologue, four main story arcs, an epilogue, two additional side stories, and one extra story.
It is revealed in the novel that before Kaito, Rin's previous partner was a cheerful boy with jade green eyes and hair who fell to earth after his wings turned pitch black as he claimed God was cruel. The setting of the story takes place on Alphine, a piece of Heaven's Paradise that fell to earth and has been protected by angels since then. When Rin becomes injured in the human world, she encounters Miku. The moment Rin touches Miku's extended hand, she feels a familiar unbearable sadness. Other important characters such as Lily, the mansion's tailor maid, and Kaito, the archangel, are introduced as the events of the Himitsu songs play out.
In the novel, Rin explains to Miku that angels have no clear gender after Miku asked if Rin was a boy in disguise due to her mannerisms. Rin explains that angels choose their appearance and that her appearance is female.