Me, the Machine! in Celebrating the New Year, Kill Like Crazy!

[New theme + Killing the designated person will turn a certain mechanical part back into a mortal body, and possess a super ability + conquer the empresses of various countries + create a high-tech ancient times. The male protagonist's biggest wish is to turn his "little bit" back into a usable state. After all, the empress is by his side, but he cannot enjoy it. How painful it is.