Samurai Sentai Shinkenger

Thirteen generations ago, special ancient samurai warriors called the Shinkenger were authorized by the Japanese Emperor to defend their country against the Gedoushuu monsters from the mythical Sanzu River. The Shinkenger succeeded, and the Gedoushuu were defeated. Hundreds of years later in 2009, the Gedoushuu have slowly rebuilt themselves and they are slipping through all dark crevasses once more to collect human screams to flood the Sanzu River into the world for their return. Takeru Shiba, the current samurai lord of the Shiba Clan, now summons four vassal samurai from different clans, and arms them with the magical scripture power known as mojikara to become the new Samurai Sentai Shinkenger!