End of Angels - Angelic Testament, #1

Lysander is an angel who has just arrived to Heaven for the first time, and he's unsure of what to think of his new home. Angels bicker over the absence of God, and an Archangel named Lucifer is stirring up controversy. As Lysander struggles to master his responsibilities, a war breaks out in Heaven, and Lysander must now choose: between God and his followers, or Lucifer and his army.