Bishuu Gyakuten Sekai de Chiryoushi Yattemasu

One day, Sumeragi Yuuto found himself unexpectedly transported to a strange new world. To his surprise, it resembled the setting of a novel he had just finished reading—except here, beauty and ugliness were completely reversed. After collapsing, he was rescued by a girl who, in this world, was seen as unattractive. Together with her and their companions, Yuuto embarks on a journey that leads to the formation of an unexpected harem.