A magnificent game of tag between a genius phantom thief and brilliant detectives.
About
It seems another calling card has arrived.
Someone whispered so.
Where is it this time?
The National Museum. Apparently, they're going to steal the "Mermaid's Tear" on display.
John Doe again...
In a small coffee shop on a street corner, such rumors spread. A name everyone knows, yet no one knows. No real name, no face, no age—no one even knows where they came from. However, they always send a notice before a theft and always seize the promised item. And they have never been caught, not even once.
The phantom thief never harms a civilian.
Like an actor performing a magnificent play on stage, they toy with the police, steal the treasure, and vanish as if nothing had happened. That is why people enjoyed the spectacle rather than fearing him.
They'll surely get caught this time, won't they?
No, that's impossible. It's John Doe we're talking about.
But the police seem serious this time.
Such conversations were exchanged all over the city.
Characters
Erloc Holmes
Male／25y/o／183cm Metropolitan Police ／ Special Crime Investigation Division
Personality
A calm, genius detective who marches to his own beat. Superior in observation and deduction, he shows a childlike curiosity toward interesting things.
Notable
He calls the genius phantom thief John Doe his favorite, enjoying the chase as if it were a game.
Jules Mejiro
Male ／ 40 y/o ／ 187 cm Metropolitan Police ／ Special Crime Investigation Division
Personality
A calm, collected, and incredibly persistent veteran detective. He never gives up on a goal and hates compromise.
Notable
Having chased John Doe for years, he firmly believes that he is the one who will catch John Doe. He feels a strong sense of alarm that Erloc is enjoying the pursuit.
Hamish Watson
Male ／ 30 y/o ／ 178 cm Metropolitan Police ／ Special Crime Investigation Division
Personality
A gentle, sincere man of common sense. A hard worker dragged around by the free-spirited Erloc, yet possesses calm judgment and reliable initiative.
Notable
A former medical professional, he is skilled in medicine and first aid. Usually mild-mannered, but shows no mercy to those who harm his comrades.
Van／Vingt
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404 NOT FOUND Profile could not be found. Known Association：John Doe Relationship：Unknown
Intro
The date is May 21, 1891.
In later years, this day would come to be known as "Detective Day." ...Though, the people of this country have no way of knowing that yet.
At the National Museum standing in the center of the peaceful city, an unusually large number of police officers had gathered.
You likely already understand the reason, dear readers.
Yes. A single letter had arrived.
There was no sender's name.
However, inside the high-quality white envelope was a single card.
Tonight, at midnight. I shall take the "Mermaid's Tear" from the National Museum.
The "Mermaid's Tear."
A massive, one-of-a-kind gemstone and a world-class treasure currently under strict display in the innermost depths of this National Museum.
Naturally, the police did not laugh.
After all, the person who sent this notice has succeeded in thefts deemed impossible numerous times and has never once been caught.
The public calls this individual by a certain name.
—John Doe.
Now then, dear readers.
The clock hands have struck midnight.
No alarms ring. No windows or doors have been broken.
And yet.
...It's gone.
The security guard's trembling voice echoed through the silent exhibition room.
From inside the glass case, only the "Mermaid's Tear" had vanished.
And at that moment, a single white card fluttered down from the ceiling.
What was written there was—
Example 1
Case 1: Erloc Holmes
Example 2
Case 2: Jules Mejiro
Release Date 2026.09.09 / Last Updated 2026.09.09
