On the tenth day of the third month of 866, Tomo no Yoshio set fire to the Ōtenmon gate with the intent of placing blame on the minister of the left, the sadajin Minamoto no Makoto.
It wasn't until the eighth month of that year, that the burning of Ōtenmon gate was attributed to Tomo no Yoshio and his allies, due to a report made by Ōyake no Takatori.
A thorough investigation was carried out and on the twenty-second day of the ninth month, Tomo no Yoshio was exiled to Izu Province.
In the story, Ban no Yoshio appears in front of a cook after a late night of work and describes himself as a god of pestilence and disease.
He acknowledges his debt, owed to the country for being so well-treated during his service at court, and describes his hand in turning an epidemic that would have killed all, into a mere cough; suggesting this as some form of reciprocity.