Children of the Whales manga volume 15 features story and art by Abi Umeda.

Chakuro, Suou and Shuan boarded the battleship Karcharías hoping 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 in order to unleash an apocalypse that will overthrow the Nouses and create a parallel world where humans will never again feel pain or sadness. When words prove useless against Orca’s sophistry, will the team from the Mud Whale be forced to use violence?!