My Sister, the Demon Spy

Lyra Everhart, true heiress of Argent Sect, returns. Adopted daughter Selene Everhart, a Demon Clan spy, frames Lyra. They find Marrow-Purifying Fruit and Black Obsidian Twin Crystals. Crystals reveal Demon Lord plants Heart-Devouring Gu in Selene, forcing her to harm Lyra. Peachwood Village attacked, family unites to fight Demon Lord Erebus. Lyra uses Marrow-Purifying Fruit to save Selene from Gu poison. Sisters reconcile and protect village.