A man goes to an undersea palace.  A crane leaves his poop as a present.  Gosuke makes money in an unusual way.
Once he started to sell them, their 
ease of use made them very popular.
Las mercancías se vendieron 
mucho y se hicieron populares
Los artículos se vendieron 
mucho y se hicieron populares,
Quando ele começou a vendê-las, a facilidade
de uso fez as coisas muito populares.