Kamen Rider Kabuto Collection

In 1999, an enormous meteor crashed onto Earth carrying extraterrestrial creatures known as Worms within it. These creatures took on the identities of real humans and then killed them. In order to counter this new threat, ZECT was formed, who in turn created the Masked Rider System to combat the Worms. The battles lasts over seven years, depleting Earth's resources and turning it into a barren wasteland. By present time, power struggles in ZECT have caused a new group, known as Neo-ZECT, to be created. Souji Tendou, a man weilding the Kabuto Zector, decides to sell his power to either ZECT or Neo-Zect for unkown reasons.

Arata Kagami seeks to get the Hyper Zecter just like Souji Tendou, so he tries to emulate Tendou. Once he realizes that he has to be himself, the Hyper Zecter appears and allows him to transform into Kamen Rider Gatack Hyper Form.

20 years after the events of the series, humans and Worms are walking towards the path of coexistence. However, ZECT is secretly developing a new Masked Rider System. Yui Kagami, the son of Arata Kagami/Kamen Rider Gatack is qualified to use the new system. Arata Kagami also investigates a ZECT conspiracy all by himself, but a shadow of an unexpected person appears before him...!