The young and naive Eisuke makes an unholy pact with the floating hermit being, Yamabushi, to summon a Shura, a reincarnated spirit of an enraged warrior, in order to revive his dead brother Masashi. However, bringing Masashi back to life held unknown consequences that the grief stricken Eisuke didn't foresee. The anger and malice harbored by the spirit now rests inside Masashi's body. A plague of darkness now has fallen over several regions. Eisuke, along with his best friends, set out on a perilous journey filled with ominous dangers that will most certainly test their grit. They embark on a mission to find answers to free his brother's body and bring peace to a world ravaged by the Shura.