Once upon a time, a Demon King named Rchimedes caused havoc and destruction in the Human World. He was sealed away by the great hero Creasion, and peace returned to the world. 
 
1000 years later, Rchimedes has returned, a hole has opened up in the Human World, and countless monsters have sprung up. To prevent any further destruction, the King calls upon all 75 (probable) descendants of Creasion.
 
This story focuses on the adventures of descendant number 45, Alba, and the royal soldier appointed to assist him, Ross. Note: Includes 1 extra chapter.

Satan Rchimedes returns to the earth after being sealed for one thousand years by a hero. The King tries to seal Satan once again by dispatching descendants of the hero. However, it's troublesome to find the genuine descendant, so the king chooses 75 hero-like people. This is the adventure of Alba, hero no.45, and his monitoring fighter Ross.

A spin-off of Senyuu. bundled with the first press release of the second Blu-ray/DVD volumes of the anime.
 
Spin-off focusing on Hero #14, Foyfoy Dran, and his royal soldier, Rudolf I. Athena. This story takes place during pre-series. Foyfoy and Rudolf are on a journey to subdue the Demon Lord. Foyfoy simply cares about the reward... but is that really the only thing he cares about?

A side story of Senyuu. bundled with the first press release of the fourth Blu-ray/DVD volumes of the anime. It tell the story of how Ross and Alba meet.

This is a manga remake of the first arc of the webcomic Senyuu. Most of the contexts are the same as the original, but in manga form instead and with various minor changes made to the plot.

Long ago, there lived an evil being who reigned over the world through fear, called Satan Rchimedes. He invaded the human world with his many demon underlings, spreading madness and chaos everywhere. One thousand years ago, this menace was sealed by the hero Creation, and peace returned to the world. 
Then, one day, a great hole suddenly appeared on the surface of the world, and a vast number of demons appeared. The king discerned that the menace Satan had returned after being sealed away for a thousand years, and decided to send the hero's descendants to battle him. He found 75 men. As one thousand years had passed, you see, it was difficult to tell who the hero's descendants were. 
So the king declared that he would grant the title of "true hero" and great fortune to the one who defeated Satan, and ordered the new hero, Alba, and his warrior attendant, Ross, on a quest to bring down the evil Satan. 
Though he struggles with lesser monsters and is even nearly killed by his partner Ross, Alba's quest to polish his fighting skills leads him to new places and new meetings that he had never expected. Battles, laughter, and emotional moments enhance this adventure tale of an incompetent hero and a sadistic warrior! 
(Source: Crunchyroll)

Senyuu+ tells stories about Senyuu characters that take place before, during or after the story of the original webcomic.

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