The Neit tribe, an extraterrestrial race living in the Neit Castle, 100 million light-years away from Earth. Their resource was music, which invaded Earth to steal Earth's music technology. In order to defeat the Neit tribe who invades the Earth using a jetpack because they cannot adapt to the Earth's gravity, the Earth deploys four elite special forces rhythm shooters to defeat the incoming Nit tribe. Let's defend the Earth by shooting and defeating the Nit coming in in four directions in accordance with the rhythm, and defeating the Nit leader.