As Fujimaru Haru, he saved mankind numerous times alongside his beloved servants. He lived as a powerless human that won over the hearts of numerous heroes of legend. As Tsugikuni Haru, he became the Sun Pillar and the slayer of Muzan. He lived as a human with unnatural strength and skill that allowed him to slay demons.
Now, with the memories of both of his lives and a new power, Haru finds himself in yet another parallel world filled with danger. How will this world react to him and...his servants?
Disclaimer: High School DxD, Fate/Grand Order, and Demon Slayer belong to their own creators! I do not own anything but my own ideas!