VoiceSlugger (1999)

The evil Emperor Genbah of the Muon Empire of the planet Tsedua seeks to use the Voistones of four children to control Demon Beast Hades, but his plans are foiled by Voicelugger Gold who takes the children to Earth. Years later, the now grown up children use the power of the Voistones to fight the Muon Empire and protect the Earth.