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)

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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.

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.

Unaired episodes of Senyuu. released with BD/DVD volumes. 
1. Yuusha, Nagurareru. / Nise Panda no Seitai (Vol.1) 
2. Shitsujichou no Tabi Sono 1 (Vol.2) 
3. Shitsujichou no Tabi Sono 2 (Vol. 3) 
4. Gakuen Senyuu.: Seishun Monogatari (Vol. 4)

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

Ou-sama