The one-shot was originally published in the July 2014 issue of Jump SQ on June 4, 2014. The one-shot was later reprinted in Shōnen Jump+ on August 24, 2020, in place of a normal SPY x FAMILY chapter, with extra content describing its connection to the manga series.
In the age where the Church is the law and witch hunting is rampant, Bel, a sword toting monk, visits a town called Brokken Brook. There, he meets a nurse in-training named Ashe who helps him treat his wound, but little does he know—just when he starts to get to know her better—who she really is.
The chapter opens onto Ashe standing in front of a judge in a court, the crowds and officials around her screaming at the judge to kill her before he announces that she has done a deed with assistance from the black magical arts and is to be executed by burning.
It then cuts to Bel, who's just fended off a number of bandits along with some of his fellow monks, asking an elderly couple if they're okay after the attack. One comments that the number of people ambushing them during journeys has risen, and Bel smiles and tells them not to worry as he'll assure they reach Brokken Brook safe and sound.