However, when an Unknown is about to attack a human, he feels an overwhelming compulsion to go to their defense, summoning a mysterious power he knows nothing about but holds the key to everything: the ability to transform into Kamen Rider Agito.
Ngoài ra, cả hai còn gặp được Ashihara Ryo, người có khả năng biến hình thành Kamen Rider Gills, người đang tìm kiếm câu trả lời cho việc cha mình bị giết một cách bí ẩn.
The show is also targeted towards adults, especially in comparison to the recent rider franchises.
Majima was unable to save Ryō on his own until Tetsuya arrived, allowing him to transfer his Agito Seed into Ryō.
Taken in by the Misugi family, he enjoys nothing more than a simple life tending a vegetable patch and looking after the household.