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Emil lost his parents in the blood purging of Palmacosta. An honest, somewhat naïve boy, Emil is a bit of a coward, and he does not like to make decisions.
One day he hears a monster's cry in the distance. Feeling like it is calling out to him, he leaves the village on his own to investigate. There he meets Marta. She seems to know Emil, though he cannot recall ever having met her before. She tells him that she is being hunted, and they agree to fight together.
It is soon revealed that he was summoned by Teneburae (English name unknown), whose voice he had heard earlier. He makes a deal with Teneburae and agrees to become a Knight of Ratatosk, thus enabling him to use Ratatosk's power during battle. Whenever he fights his eyes turn red and his personality changes into that of a cruel fighter, causing some to see him as a monster
Marta lost her mother during the Great Kharlan Tree's rampage. She tends to think along right-and-wrong lines. A bit of a tomboy, Marta is passionate about getting her way. On the left side of her forehead lies the Ratatosk Core, imprisoned in a dormant state. Emil became her guardian knight in order to protect her and the Ratatosk Core. She views him as effeminate, but believes he possesses a hidden strength.
Richter is a young man on a journey to find the Ratatosk Core. Since he was oppressed as a child, he now hates those that oppress others; he also hates those who do not stand up for themselves. His extremely distrusting nature causes him to be harsh in order to see his goals met. He first encounters Emil while saving him from being bullied. Although the boy's timidity and passiveness irritate him, he resolves to teach him the basics of fighting.