As a member of the The Aces, Deino was an observer to Ryver’s official trial to be a fledged member. He watched the young rescue pursue on a task that was provided by the captain. He was and the others were under orders to not interfere unless he gave the order.
Deino was one of the few who were sent after Ryver when it was proven that he was going to fail in his mission. After diving into the water alongside Natsuru and Blackjack, they found themselves amongst a set of old ruins. The three of them explored the space but were unable to find any traces as to where Ryver went. They did find pieces of his shorts that were shredded and left behind.
While searching the area, they were attacked by members of The Hourglass Pirates. The enemies retreated and the Aces pursued. Following them to their hideaway, they were caught up with the others in a long combat and were able to rescue Ryver from captivity.
Upon their return to the ship, they discovered their captain having a confrontation with two unfamiliar visitors. They hid along the side of the ship until they disappeared.