Megasameru to Hyakunen-go no Koukyuu deshita Koukyuu Jijo Kougyoku

After being put to sleep for 100 years by a curse, harem maid Hayashi An wakes up in the arms of a handsome man who looks just like her fiance!? She changes her name to Kougyoku and takes on the harem's 100-year-old conspiracy!

(Source: Kadokawa, translated)