Manga by author Yoshinori Kisaragi

Lise, a knight and daughter of a baron of the Kingdom of Olwen, lost her life protecting the young imperial prince Egbert. After death, she wakes up in the future with all her memories! But somehow she's become engaged to the imperial prince?The story of a (Former) Lady Knight trying to dissolve her engagement?!A romantic comedy about a reborn Court Lady with a secret!

A sudden cold current swept the earth. The burning hot summer has turned into extreme winter cold. The whole world looks like it is the end of the world. Even worse, scary and deadly creatures hide beneath the thick snow... they are the Snowmen...