Battle simulation system

Kai Raven, a member of the prestigious sword clan, woke up and followed his usual routine, heading straight to the library of the Raven clan. Unlike his talented brother Nathaniel, Kai was born with the inability to harness Mana. However, Kai harbored a secret. He was originally from the modern world but had died and reincarnated into this fantasy world. Upon his reincarnation, Kai found himself equipped with a system. Unfortunately, every attempt to access the system resulted in an eternal loading screen, until now