Kunikida's entire philosophy gets tested in real time, and watching him choose his ideals over the easier path is quiet and brutal. This OVA doesn't pretend to be more than what it is, a single episode that cares only about whether you understand why he can't compromise. You'll recognize yourself in his logic, and that recognition will hurt.
Atsushi receives an unexpected visitor at the Agency: a mysterious man claiming to know secrets about his past. When the stranger vanishes without a trace, Atsushi finds himself drawn into a peculiar case that forces him to confront uncomfortable truths about his own origins. With Dazai nowhere to be found and the Agency's usual crew scattered, Atsushi must navigate this investigation alone, questioning whether he can trust the information being fed to him or if it's another trap set by enemies old and new. The case spirals into darker territory as supernatural abilities clash and the line between ally and adversary blurs. Atsushi's search for answers becomes a test of his instincts and resolve, pulling him away from the comfort of his found family and into territory where his wits matter more than his power. Comical moments punctuate the tension, grounding the mystery in character dynamics that define the series. This standalone chapter captures the pulse of the larger conflict brewing in the background while giving Atsushi a moment to stand on his own.