Zettai Meirei

A chief priest known for wisdom and intelligence develops feelings for a sword's heroic spirit named Kazuto, leading to a tale of a love that is not permitted. Another sword spirit, Mikoto, who is responsible for purifying wickedness, comes to understand the nature of love through a bond with a fourth sword spirit named Shiou. However, Shiou becomes a pawn for an assassin released by a political rival.