Saint Seiya: Meiou Iden Dark Wing

A high school student named Shouichirou becomes Wyvern, one of the Judges of the Underworld, and is drawn into a conflict involving Athena. During a school trip, he and his classmates are ambushed and transported to the afterlife, where they become involved in a battle between divine forces. Hades' forces are already active, and Shouichirou's life changes permanently. Cattleya, who is Athena reborn, works to protect the living while uncovering a deeper conspiracy that challenges their understanding of the situation.