After being hit by a truck, Yuuta is reincarnated into another world and becomes the hero who defeats the Demon King. Ten years later, his exciting life has turned into a dull and unhappy marriage with the princess. Longing for the excitement he once had, he reconnects with Luca, a female warrior who fought beside him in the past and also lost her husband. Their growing relationship leads to a forbidden romance that threatens both their lives and reputations. The story mixes fantasy adventure with romance, drama, and the struggles of life after the “happy ending.”