Synopsis

After a monster attack breaches the ship, the crew works together to seal the holes using planks and slime. The main character acquires a new trident, seemingly resistant to the poisonous waters. Reaching the Red Zone, the ship abruptly changes course towards the enormous root of the World Tree. The main character then jumps into the poisonous sea to stop monsters using his Dragon Energy Arts which he reveals is a legendary "Zero Numbering" technique.