Space aliens from a different planet invade earth in attempt to expand their territory. They are confronted by 3 Individuals who have overwhelmingly mechanic technology and individual creativity.

There is an ancient prophecy shared amongst the kingdoms of Earth — two thousand years after their fall, the Earth Empire Bugnarak will once again rise up to Kill All Humans. However, five kings and their guardian deity, King-Ohger, will stand up to face them. This is the story of kings who will defend the Earth, as well as a Coming of Age Story for one young man who will achieve kingship henceforth.

A man called Jin Momoi finds a baby inside a peach-shaped capsule whom he names Taro and raises. 21 years later, mysterious monsters called the Hitotsuki begin appearing when humans overcome with their inner desires are taken over by spirits infused with powers related to the Super Sentai from the past. Taro, and four other individuals selected by Jin; Shinichi Saruhara, a smart but eccentric young man, Haruka Kito, a highschooler manga artist, Tsubasa Inuzuka, a wanted fugitive, and Tsuyoshi Kijino, an ordinary salaryman begin fighting the Hitotsuki and saving their hosts as the Donbrothers.

Also standing on their way are the Noto, elusive and ruthless creatures from a higher plane who destroy the Hitotsuki while killing their hosts, unlike the Donbrothers who use their powers to rescue them. The Donbrothers also count with the secret help of Kaito Goshikida, the owner of the coffee shop Donbura who transforms into Zenkaizer Black