Children of the Whales manga volume 16 features story and art by Abi Umeda.

Chakuro, Suou and Shuan ventured to the battleship Karcharías to convince Orca to release Ouni and Lykos. But instead of rescuing their friends, they are now caught up in Orca’s plan to destroy the Mud Whale and all its residents! He claims this will unleash an apocalypse and overthrow the Nouses, creating a parallel world where humans will never again feel pain or sadness, but Chakuro and his friends aren’t interested in that kind of future. When words prove useless against Orca’s sophistry, will the team from the Mud Whale be forced into violence?!