Kaiso is a town built over the sea that has a large infestation of seaweed. A lovely kid called Ito and his special best friend: Moss the manatee, work hard everyday to clear the path between the houses and allow the villagers to live in peace. One day, Ito accidentally starts an adventure through some nearby cliffs. What will it mean for him to leave the small town for the first time? Will Moss be able to find him?