DazyHaze's manga / #Full Color(10)

School idol Holy proclaims to her childhood friend "we will travel the world and get a married" and is determined in highschool to make him her blushing boyfriend. However, dies during her confession by accident. Her friend who can see and get possessed by ghosts makes a deal with a reaper to extend his girlfriend life with his own causing her to be able to leave her body and strike a deal with the reaper to put other souls to rest to prevent what she thinks is her boyfriend's death. Slapstick comedy and very full of feels

She went back in time during a tough political landscape as a recently married than young widowed marchioness tasked with raising three kids from a previous wife with pressure from her family and social circles