Invited by Jun, the Science Ninja Team visits a concert by the popular rock group Demon 5. The Demon 5 is kidnapped by Galactor right in front of them.
Galactor has Demon 5 play the murder music composed by X. Using a Sonic Mecha, they start to play this music high above the city. The music destroys buildings and drives people crazy. The God Phoenix is mobilized, but meeting a counter-attack, it's forced to retreat for the time being.
Revived by the operation's success, Katse has Demon 5 play another powerful murder music, but this time, the drummer uses his sticks to add a morse code signal. Jun notices this signal woven into the music. The analysis reveals that the signals tells the location of the Galactor base.
Hurrying there in the God Phoenix, the Science Ninja Team saves Demon 5 just before their execution. But they are attacked by the Sonic Mecha. They get advice from Nambu that they should emit the same sounds, delayed by half a tact. As they follow this advice, the magnetic waves from the Sonic Mecha are interrupted and it self-destructs.
Back home safely, the Demon 5 are in concert again. The Science Ninja Team is present as well, listening to the music as common people.
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