She Was Pierced Through the Heart by the Demon Lord's Sword, but She Regretted Pursuing Her.

After three hundred years of cultivating immortality, he shouldered a heavy crime and died under the sword of his favorite junior sister, just in exchange for the right to return to Blue Star. But when he finally returned to Earth, he found that the world had been torn apart by the revival of spiritual energy, monsters were rampant, his home was occupied, and his only relative was missing. And the demon lord junior sister who was betrayed by him traveled across the star sea for a thousand years and trampled the planes to find him. Two worlds, when the former Immortal Lord and Demon Lord reunited on earth in the last days, they discovered that they were just two interdependent chess pieces in a chess game of heaven that spanned planes.