孕ませて王子様！ 異世界で王子になった俺は巨乳なお嬢様たちと子作りハーレムライフ！ (Associated Names)

The main character, Shota, is an ordinary student. When he returned home as usual and opened the door, he was transported to a royal palace in a world he had never seen before. There, he meets the prime minister, Berlina, who informs him that Shota’s face looks exactly like the dead prince. Shota is asked…