A pack of monsters calling themselves the "Clan of the Seafolk" arrive on the shores of City J intent on invading the land. When the hero sent to fight them is defeated easily by the Deep Sea King himself, Saitama and Genos head for the city to help.
Besides…if it comes down to it,
،أيضًا... إن اقتضى الأمر
Und wenn’s hart auf hart kommt,
halten wir alle zusammen
Et même si le monstre surgissait,
on s’unirait tous
E se ce ne sarà bisogno, batteremo
quei mostri unendo le nostre forze.