A Myth That Holds An End Episode 1

Pierre Vieira and Silvia de Alisia are out on a mission in Arc City to find the reincarnation of the "Solar Wing", and their current target is an orphan named Apollo. However, Shadow Angels suddenly attack the town, and DEAVA sends out a Vector unit consisting of Sirius de Alisia, Glen Anderson and Hong Lihua to deal with the threat. When a Shadow Angel stronger than the others, known as a Cherubim, appear, can they hope to win? Also, how does Apollo relate to all this?