After his first death, Shinnosuke Yamagami became a psychopomp, a creature meant to help the deceased pass on to the Nether, the land of the dead. However, Shinnosuke's branch of work was much less poetic; his job was to hunt down runaway spirits that escaped to the mortal realm. Now, Shinnosuke faces his second death--the death of the soul. In his final moments of existence, he recalls the stories that will remain after him; his journey with the demonic corgi Yago and his battles with spirits that spread terror amongst humans. And among those stories was Mirth, a fox creature in human form who frequently yanked the psychopomp out of his routine work and flung him into chaos.