Kirino Frigate

What if you were reincarnated into a parallel world where women protect men instead!? Aoi Souma is reborn as a boy in a version of Japan where women vastly outnumber men—and pretty much everything works differently from the world he once knew. Humans have awakened to psychic powers, invaders threaten the world, and even the rules of chastity have been turned upside down... After regaining the memories of his previous life, Souma takes the new world in stride and sets an ambitious plan in motion: to win the hearts of women everywhere. This is the story of a boy who makes the most of a society built around managing and protecting men, all in pursuit of one goal: his ideal harem.