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By the author of Medical Return! After breaking his back working with the Hero's Party, Chris w...
MC was a party member of the Hero who was extremely intelligent, able to learn quickly. However, the Heroes were unable to stop Ragnarok and so the world ended.
But, MC was reborn in the past, as a noble from the Demon family.
With the knowledge of his past life and his gift of intelligence, he sets to save the world by becoming the ruler of demons and prevent the war that would feed Ragnarok.
MC was previously bethrothed but now he just focuses on his goals. 50+ and no obvious signs.