Sousei no Onmyouji / 双星の陰陽師
Rokuro Enmado is a young boy who used to be a powerful aspiring exorcist, before a tragic incident left his friends dead and made him abandon the profession.
One day, he has a fateful encounter with Benio Adashino, a girl around his age and a well known exorcist from the east.
According to prophecy, Rokuro and Benio are the “Twin Star Exorcists”, and are destined to marry and have a child known as the Miko, which will be the ultimate exorcist, capable of cleansing all evil spirits, or Kegare, from the world and ending the war that has lasted over a millennium.
陰陽師候補的少年焰魔堂 轆轤捨棄了過去想成為陰陽師的夢想，每天渾渾噩噩的度日。
某天，轆轤與同為陰陽師的少女化野 紅緒一同被選為「雙星之陰陽師」，賦予了兩人將會結合，誕下「神子」以終結長年來和「汙穢」的戰鬥的使命，並強制兩人同居過著夫婦生活。
被迫接受而對此感到不滿的兩人就此踏上了必須同心合作和汙穢交戰的道路之上。