Archbishop Wing plans to use the poison of the inhuman Plantaingan, combined with 30,000 volts of electricity, to create miniaturized people preserved for use in creating cyborgs. The mutant kidnaps a young boy's sister and Kazami Shiro must fight in order to save her. Plantaingan attacks Rider Scouts HQ to liquidate a captured Destron Soldier and threatens Tachibana Tobee and Company. Can V3 liberate them from the tendrils of death?