Arata Kagami seeks to get the Hyper Zecter just like Souji Tendou ... the Hyper Zecter appears and allows him to transform into Kamen Rider Gatack Hyper Form ...

In order to counter this new threat, ZECT was formed, who in turn created the Masked Rider System to combat ... Souji Tendou, a man weilding the Kabuto Zector, decides to sell his power to either ...