In this strange world, creatures from the Demon Realm are constantly tearing at the boundary between it and the mortal world!
A boy with no aptitude for combat accidentally enters a rift into the Demon Realm. His sister pays a price close to death to save his life, and the timid boy finally awakens! After fusing with the Dark Eye of a male mage from DNF and enduring one spatial trial after another, he eventually becomes the strongest mage!
"I'll trade a lifetime of suffering for power, and use that power to protect the sister I love most!"
This novel and its characters are entirely fictional. Any resemblance is purely coincidental. Do not imitate.
