The plot for both series are very similar. They involve an organization that protects the people from Gaist/evil Gyrozetters who attack their hometown. In Gyrozetter: our main casts battle in their transformer type car. In Gaist Crusher: they battle in power suits (power ranger/kamen rider) which are powered by these Gaist crystals or Gaimetals. Gaist are mythical creatures such as Fenir, Garuda, and Yatagasaru etc. Shirogane Rekka and Todoroki, Kakeru are both reckless, loud, energetic, and determined. They are willing to learn from their mistakes and better themselves. Kongouji Hayato and Hayami Shunsuke is basically the rival to Rekka/Kakeru. Both are cool and smart. They will learn from Rekka/Kakeru and vice verse. Sango, Sakura and Inaba Rinne are very supportive to Rekka/Kakeru. Willing to help them when they need it. Also the love interests in both series. Both series catered to children.