Kiran, the strongest old soldier who fell in battle against the Demon King and lost his life, accepts a proposal from a goddess and is reincarnated. However, his new life begins as the daughter of the Heikera Baron family...!? The story follows the adventures of Kikka, the reincarnated daughter who retains the skills of her former life as a seasoned warrior, particularly the powerful "Magic Bullet" skill. As she boldly rises to prominence, her bravery attracts people to her side.

Satou Sou is accidentally swapped with himself in a parallel world with a male/female ratio of 1:39. He finds a kind family and lovely women at the place where he was switched. Seeing the outside of these women, he's relieved to see that the number of men and women has changed, but not much else. However, their inner lives are filled with conflicts and troubles.