Takumi and the children helped the merfolk and were generously rewarded. They head to a small island to finally master water magic, but then they encounter a strange monster.
I learned of the problem 
in the mermaid village.
‫علمت بالمشكلة في قرية حوريات البحر.
bemerkte ich das Problem
der Meermenschensiedlung.
j’ai remarqué un problème
au royaume des sirènes.
sono venuta a conoscenza
del problema nel villaggio delle sirene.
descobri um problema
no vilarejo das sereias...
Выяснилось, что у русалок беда.