Angel/Dust

Yuina Hatori is a shy high school sophomore who lives with her aunt because her mother is deceased and her father is too busy with his work to care for her. She dislikes speaking up for herself because she fears troubling others. Her one passion is singing, but as she is so timid, she is unable to sing in front of others. She believes her life to be normal, but then she has an encounter with Seraph, a humanoid android, an "Emulate" who is searching for Lucifer, the "black winged one." Things only complicate more when Yuina's childhood friend, Akiho Kudoh, transfers to her school.