Rise of the Stay Abyss Overlord - Episodio 1

Xavier, a military pilot, wakes up five years in the past at the ceremony where he and his brother Zane are to choose their mecha cores. In his original timeline, Xavier chose the powerful SSS-class 'Red Angel' and became a hero, only for Zane to betray and kill him out of jealousy. Now, Zane publicly manipulates the situation, pretending to selflessly take the dangerous Red Angel core for himself due to Xavier's supposed injury. Xavier's fiancée, Anne, breaks off their engagement, siding with Zane. Xavier realizes Zane has also been reborn and orchestrated this public humiliation, but he knows the horrific truth about Red Angel and coldly watches as his brother and former fiancée seal their own grim fate.