Young Dai lives on Dermline Island, where he dreams of being a Hero. One day, a Hero and his companions come to the island. Dai is excited at first, but their true intent is to steal his best friend, Gomechan, the mythical Golden Metal Slime.
We monsters, who were
under the thrall of the Dark Lord,
تحرّرنا نحن الوحوش الذين كنّا عبيدًا لملك الشياطين
Wir Monster, die wir Sklaven
des Dunklen Lords waren,
Los monstruos que estábamos
bajo el yugo del Señor Oscuro
Los monstruos que estábamos
bajo el yugo del Señor Oscuro
Nous, les monstres,
esclaves du seigneur du mal,
Noi mostri, che eravamo
 alla mercé del Signore delle Tenebre,
Nós, monstros, que estávamos
sob o domínio do Rei Demônio,
Чудовища, находившиеся
в рабстве у владыки тьмы,