In a world where beastmen and humans are at odds with each other, Wult was born half-beastman and half-human. Thus, he spent his days being looked at with disdain by those around him.
However, his dream is to fulfill his brother Leo's wish to "kill the beastman who killed his sister", as he was the only one who treated him as an equal.
Therefore, despite being a half-beastman, Uruto wants to join the anti-beastman unit, "Narukami", as a means to achive his goal.
Unfortunately, on the final day of the enlistment process, Uruto is faced with the ultimate choice in order to make his dream come true...