Tensei Shitara 15-sai no Ouhi deshita: Moto Shachiku no Watashi ga, Toshishita no Kokuouheika ni Semarareteimasu!?

I, Saeki Emi, died of exhaustion when I was 28 years old, but awoke to find myself reincarnated as a 15-year-old queen. Being a queen means that I have a husband? His Majesty, the king? But...turns out he's 17 years old! I thought I'd be pampered and spoiled in this life, but His Majesty knows my situation, and tells me that the lives of the reincarnated may be targeted! What's more, the former host of this body, Emilia, appears as a ghost. Don't you think my second life is already eventful enough? I thought I was free from my corporate job and would be able to lead a life of leisure this time around...! This is a healing romcom set up in the Royal Palace that's a little different from your usual reincarnation story! (Source: Manga UP!)