H + P Hime Para

Kamiku Kyotaro is a straight-laced high school boy, who is good at Japanese fencing. One day, he wakes up to find himself warped into a different world. He is summoned by Trekwards Kingdom: the queen has fallen ill to a mysterious ailment, putting her country in dire straits. Since women dominate over men in the world, Kyotaro is put in the harem of the royal house and forced to make love with the five princesses in order to have a heiress.