I traveled to another world and was told to be an "Emperor". The perk is a lot of wives!? I was summoned to another world. What is this!? I'm supposed to be the Emperor's body double!! The bonus is that I will have many cute wives... But first, I have to win the war. An unparalleled other world fantasy!!
Taikoku Cheat nara Isekai Seifuku mo Rakushou desu yo? is a completed manga by Kaima Takaaki and Yatuki Akehisa, first published in 2018. It blends romance, comedy, isekai and fantasy. You can read all 11 available chapters of Taikoku Cheat nara Isekai Seifuku mo Rakushou desu yo? online for free on MangaPulse; the newest is Chapter 11, added 2020-08-02. The series is finished, so you can read it from start to end in one go.