Reenacting the Unsolved Case: And Thus, Death Smirks

Unsolved cases. Cases where the perpetrator was never found and the investigation was closed. Including cases that were never even investigated and simply vanished—how many must there be?

They exist not only in this world but also in worlds of magic, worlds where robotic technology has advanced, and even in various unknown worlds beyond our own.

The regret felt by the investigators, not to mention the victims' families, must be immeasurable. Surely, some have staked their entire lives on solving these cases.

For mystery enthusiasts, the puzzles of unsolved cases must be like sweet fruit. They form countless theories and engage in discussions. But even if the truth lies somewhere among their theories, it can never become the definitive answer. After all, there is no evidence.

Only the perpetrator knows the answer.

However, exceptions exist.

Not among the living, but among the dead.

There exists a place that can only be reached by the souls of those who devoted their lives to these cases.

A library—or rather, a detective agency—where an unusual shinigami dwells.

This time, the one who visited this agency was...