Sairin Yuusha no Fukushuutan: Yuusha Yamete Moto Maou to Kumimasu

Amatsuki Iori, a high school student, is summoned to a parallel world and becomes a Hero to save the land. During his mission, he is betrayed and killed by his allies. He awakens again, this time summoned into the future as a Hero tasked with defeating the demon king he previously failed to stop. Memories of his former companions resurface, filled with resentment. A former demon king girl appears, also seeking revenge against those who wronged her. Iori, now driven by vengeance, abandons his previous ideals and teams up with her to pursue their shared goal.