Reincarnated Once Again?! ROC

Cyrus was an ordinary salesman, living an ordinary life, in an ordinary relationship.
Yet, this man held a secret, and it was everything but ordinary.
Once, he had roamed another world, one of swords and magic, and of dragons and gods.
Except, having had no magical or martial talent whatsoever, he was but the lowest caste of society, less valued than the beef which the aristocrats feasted upon.

Those who had no strength had no say in their life, and Cyrus was the same, being sent off as cannon fodder in a war in order to become a 'martyr' and change public opinion on the war.

War brought only death, and before he even realized it, his heart was slowing down, and his arms had no more strength to move.
When he opened his eyes again, he found himself in a strange world.
Here, there was no magical talent, but brains and stupidly complicated mathematics.
However, this was good enough for him, as he realized he could still become worthy of respect if he just worked hard enough.
And that, he did.

Yet, as the ruthless sickle of the reaper knocked on his door again, he would wake up, only to find himself back in the world that he loathed so very much...