Bishamonten/Synopsis

History
Centuries earlier, Bishamon had many Shinki. However, because of their numbers, she was unable to effectively watch over them, and they became corrupt. Unbeknownst to her, one of her few pure Shinki, Kazuma, requested that Yato slaughter all of her corrupt subordinates. Yato, heeding this request, did so, and Bishamon vowed revenge against him.

Yukine Arc
In her debut, Bishamon is seen discussing Yato with Kazuma. Later, she appears, suddenly, on the street, where Yato, Yukine, and Hyori are conversing. Bishamon then attacks Yato, who counters with the Sekki, slicing her Shinki, Kinuha, and Kuraha. He is then forced to retreat with Yukine. She then searches for him, using Kazuma, and follows him to the forest, where he had hidden.

However, before Bishamon can continue her assault, Kofuku appears, opening up a Vent with Daikoku. Bishamon was about to give chase to Yato, when Kazuma tells her that, though she may be willing to pursue Yato no matter what the costs, he would not allow her to risk further harm to her Shinki. Bishamon retreats but not without warning.

She later visits Kofuku, asking about the latter's intervention in the battle. Kofuku tells Bishamon that, if something were to happen to Yato, she should be prepared for "a lot of Gloom". Bishamon is shocked by this and departs.

She's seen multiple times bathing, and later taking medicine given to her by Kugaha, for her growing Blight. It is seen that Bishamon has a habit of taking in lost souls, making them her Shinki. However, having so many Shinki wears on her, and it makes it difficult for her to care for all of them. As a result, many of her subordinates are seen feeling neglected or unloved; but, they attempt to put on a brave front to lesser their master's burdens.

Later, upon noticing the death of Suzuha, Bishamon is distraught by the loss of one of her Shinki.

Upon the discovery of Suzuha's death, Yukine, his acquaintance, follows Kazuma to Bishamon's shrine. When she sees that Yato's Shinki is in her home, she is furious. She is even more disturbed to see Kazuma conversing with him. She demands an answer from Kazuma, asking him if the rumors of his involvement with Yato's Purification Ceremony are true. When Kazuma confesses that they are, she is distraught. She accuses him of betraying her, to which Kazuma counters that Yato is their "benefactor". Bishamon, furious, attempts to shoot Yukine with Karuha; however, Kazuma draws a Boundary between them and Bishamon. Bishamon, shell-shocked, prepares to excommunicate Kazuma; however, she hesitates, choosing instead to exile Kazuma, telling him that he "could become a Stray for all she cared". She then departs, stricken that Kazuma, her blessed Shinki, has betrayed her.

When Yato believes Bishamon has kidnapped Hiyori after she vanishes with two rogue Regalia, Kugaha pushes his plan further. He unveils that the blight caused by one of the infected Regalia, Aiha. This leads to a confrontation in the shrine while Kazuma and Hiyori deduce Kugaha's plot to succeed the war god.

When Kazuma intervenes and is dealt a devastating blow, he tearfully confesses his involvement in the slaughter of the Ma Clan. A tearful Bishamon is told the truth of Kugaha's scheme for her to "repent", only for Yato to cut off his hand and state that Gods can do no wrong. After finding that Kugaha's intentions were for the best interest of Bishamon, she accepts it as truth and revokes his name before casting him away, subsequently dealing with the masked Phantom that had slaughtered most of her Regalia.

After nursing Kazuma back to health, she asks him to be her Exemplar once again, and he gratefully accepts. She, sequentially, begins a diary to exchange among the remaining Regalia in order to get to know them better.