A brilliant phantom thief and a genius detective engage in a magnificent game of cat and mouse.
About
It seems another calling card has arrived.
Someone whispered.
Where is it this time?
The National Museum, apparently. They're going to steal the 'Mermaid's Tear' on display.
John Doe again...
Such rumors spread in a small corner cafe. A name everyone knows, yet no one knows. No one knows their real name, face, age, or even where they came from. However, they always send a notice before a theft and always take the promised item. And they have never been caught, not even once.
The phantom thief never harms civilians.
Like an actor performing a brilliant play on stage, they toy with the police, steal the treasure, and vanish as if nothing happened. That is why people enjoyed the spectacle rather than fearing him.
Won't they get caught this time?
No, impossible. This is John Doe we're talking about.
But I heard the police are 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. Excels in observation and reasoning, showing childlike curiosity toward interesting things.
Notable
Calls the genius phantom thief John Doe his favorite, enjoying the pursuit 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 extremely tenacious sharp detective. Never gives up on what he has decided and hates compromise.
Notable
Has chased John Doe for years and firmly believes he will be the one to catch John Doe. He feels a strong sense of crisis that Erloc is enjoying the pursuit.
Hamish Watson
Male ／ 30 y/o ／ 178 cm Metropolitan Police ／ Special Crime Investigation Division
Personality
A gentle, sincere, and sensible man. A long-suffering soul swung around by the free-spirited Erloc, yet possesses calm judgment and reliable initiative.
Notable
A former medical professional, highly skilled in medicine and first aid. Usually mild-mannered, but shows no mercy to those who harm his comrades.
Van／Vingt
ERROR !
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 town, an unusually large number of police officers had gathered.
You, dear readers, likely already know the reason why.
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 jewel like no other in the world, a global treasure currently strictly displayed in the innermost depths of this National Museum.
Naturally, the police were not laughing.
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 person...
...John Doe.
Now then, dear readers.
The clock hands have struck midnight.
No alarm sounds. 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 within 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 2026.09.12
