Aboard the S.S. Vanish (Heaven's Rascals) (Volume 1)

Cassiel (Cass) and Kerubiel (Keru) are two young angels undergoing training in heaven. However, they couldn’t wait much longer to be given a mission by the archangels, so they sneak out of heaven and get one on their own. They would explore the mysterious disappearances in the Bermuda Triangle. Can what awaits the Heaven’s Rascals be more than they could handle?