ChouSeiShin GranSazerwas a joint production from Toho Company Ltd. and Konami. It ran from October 4th 2003 to September 25th 2004 (51 episodes). It is the first installment of Toho’s “Seishin (Star God)” franchise.
The series takes place some 400,000,000 years after an advanced human civilization was destroyed by aliens, 12 direct descendants of the civilization’s warriors (called “Sazers”) have their powers awakened and form four tribes: Flame, Wind, Earth and Water.
Each Sazer is based on a Zodiac sign represented in an animal totem or spirit representation. At first, they wage war on each other, but after learning the truth of their ancestry and their reason for awakening, the Gransazer tribes unite to protect Earth from the Warp Monarch, an alliance of various alien species, from once again extinguishing all life on the planet.
The Wind Tribe are the first tribe fully assembled, deceived by Karin to attack the other GranSazers, especially the Flame tribe. After they realized they were being deceived, they turned against Karin and allied with the other GranSazers to defeat her. The members of the Wind Tribe are all insect-based, with shades of purple and pilot the Wind-Driver Grand Vehicles.
The Flame Tribe are the first tribe to recognize the alien threat and the second to be fully assembled. From the very beginning, they were assisted by Professor Horiguchi, who helped them realize their duty as Gransazers. The armoured suits of the Flame Tribe are all based on birds. Their suits are also shades of red, and they pilot the Flame-Driver Grand Vehicles.
The Earth Tribe are the third tribe to fully awaken. This tribe is the most divided one because each of the three members has a personality that conflicts with the others sometimes. Karin tried to enlist the Earth Tribe into her group, but failed, causing the Earth Tribe to fight together with the Flame Tribe. Their armoured suits are based on mammals and are yellow or orange-shaded, piloting the Earth-Driver Grand Vehicles.
The Water Tribe appeared after the Akelon incident and was the fourth to awaken fully. Led by the strict and mistrusting war photographer Makoto, this tribe fought a while on their own. After having been completed as tribe and awakened their ChouSeiShin, Leviathan, they joined the other Sazers. The suits of the Water Tribe are based on sea animals and have shades of blue, piloting the Aqua-Driver Grand Vehicles.