It aired as a part of TV Asahi's 2003 Super Hero Time block, alongside Bakuryū Sentai Abaranger.

He sends them to his foster children (dubbed the "Ryuseiji", after the school they attended) so they can stop the Orphnoch from achieving their goal.

However, Rider Gears were designed to be worn by an Orphnoch, and humans are unable to activate the systems without undergoing genetic modification.

A young loner, Takumi Inui, is unwittingly drawn into the conflict between the Orphnoch and humans and becomes Kamen Rider Faiz to save the life of Mari Sonoda, one of the Ryuseiji.

However, there is division amongst the Orphnoch, as those who wish to co-exist with humans rather than kill them, begin resisting the Smart Brain, who in turn targets them as well.

Most of these "renegade" Orphnochs are either killed, remain neutral, or begin siding with the Ryuseiji against the Smart Brain.

When the Tokyo police discover the Orphnoch are behind a series of bizarre murders, they begin operations to defeat the creatures, largely unaware of the various factions involved.

The Orphnoch King eventually awakens within a young boy named Teruo Suzuki, whom Naoya Kaido and Keitaro Kikuchi saved and befriended.

Each Rider Gear contains a belt known as a Driver used to form armor that protects the wearer and amplifies their strengths and abilities.

The Gears also have a method to input command codes, a cell phone number keypad for most, which can activate armor and various weapons.

During the TV series, Hanagata, the foster father of the Ryuseiji and former chief executive of Smart Brain, attempted to create several new Rider Gears, using two lost people to test out the first two.

Kamen Rider 555 the Movie: Paradise Lost (劇場版 仮面ライダー555 パラダイス・ロスト, Gekijōban Kamen Raidā Faizu Paradaisu Rosuto), was released during the run of the series, as a double feature alongside Bakuryū Sentai Abaranger Deluxe: Abare Summer Is Freezing Cold!

Kohei Murakami and Kento Handa were confirmed to reprise their respective roles from Kamen Rider 555.

To promote the release, the cast reunited after 10 years, but they remarked that not much has changed, other than Yoshika Kato changing her stage name to Leilani Gaja and her new life in Hong Kong and series lead Kento Handa's recent popularity on the variety show Tamori Club where he has surprised guests with his knowledge of high-rise buildings and kayōkyoku.