Hoshiyomi no Yogensha

From Aerandria Scans: The uncommon fortune-teller Grand is the one who rules Dene, a big country. Tia, an assassin, was sent there to assassinate him! Already lost the will to live and failed her mission as an assassin, Tia was saved by Riis, the head of Grand’s guards. Gradually, Tia starts to regain her will to live, however…?!