[To ensure that your plan wouldn't have any unknown variables, you didn't forget to use Hint Prompt in a 1km diameter with Aihara Makoto as the center.]
[It was only after doing so that you discovered a veteran Train Conductor at Mid Platinum rank was secretly staking out Aihara Makoto. From what you discovered, that Train Conductor had a special artifact in the form of a Magnifying Glass which could pick up clues on the target.]
[However, that artifact was too low-grade, only at Late Iron-rank, which was why he was able to make use of it in this station without alerting the Angels of Death and breaking the ten rules imposed by the Angels of Death.]
[Losing interest in that low-grade item, you pondered, 'It seems this veteran Train Conductor used the Detective's Magnifying Glass to look for clues that would lead him to a Death Papyrus user.']
