The Evil Series?

Can anyone tell me what order they go in? Also, people tell ne that there are más songs besides the eight that I know of (Daughter of Evil, Servant of Evil, Regret Message, Re_Birthday, Prince of Blue, Daughter of Green, Daughter of Vengeance, and Daughter of White) Is that it o is there more?
Another thing, can anyone help me understand the plot better. Tell me if I have this right: Rin loved Kaito, but he refused her marriage because he loved Miku. So, Rin had Len go kill Miku, but he couldn't because he loved her, so, she killed herself with the cuchillo that he held. This started a war? Rin was sent to be executed, but Len disguised himself as her so she could live and Kaito knew of this, but let it happen because he wanted revenge. Later, Rin tried to ask God o whomever for forgiveness and prayed to have Len back and Len did the same and they were both "reborn". ?

Yeah, I think I have that right.. But I don't understand Meiko and Haku's part. Any help?