When the alien Mimics invade, Keiji Kiriya is just one of many recruits shoved into a suit of battle armor called a Jacket and sent out to kill. Keiji dies on the battlefield, only to be reborn each morning ...

However, his life is turned upside down due to a daughter-in-law he made by chance, and the real ‘assa’ Ji-won Lim lives as ‘insa’ Kim Si-hoo. The more he falls into the life of the daughter-in-law,...