Humans live in the world of Assiah, demons in Gehenna. The two dimensions are not meant to interfere with each other, but demons still possess creatures in Assiah in spite of this. The humans who can fight these demons are known as exorcists. Rin Okumura is a boy who bears the curse of being Satan's illegitimate son. His foster father sacrificed himself to save him from demons. To avenge his foster father's death as well as to prove himself, Rin decides to follow the path of an exorcist.
In the second season of Noragami the main focus is on Bishamon, god of war. She has many shinki due to her being unable to abandon spirits attacked by Ayakashi. She has a large group of shinki with her as leader, causing her trouble as she sometimes cannot tend to all of them properly, especially when one of them gets sick or is in pain. She has a strong hate for Yato, as a dark past binds the two of them. How will the horrifying events dated hundreds of years ago in combination with current evil happenings affect Yato and Yukine?
In the "Great Disaster," Japan has been thrown into chaos by onmyouji (a kind of magician). Harutora Tsuchimikado was born into an onmyouji family, but has no power whatsoever. His childhood friend Natsume (another member of the Tsuchimikado family) appears to him one day to take him up the promise he made long ago to become her shikigami (familiar). A battle between onmyouji is about to begin.