If you ever played ninjas as a kid, wishing you could actually become Japan's most famous covert agent - well, do we have news for you.
The practice is believed to have started as early as the 12th century and they were mainly used for espionage, sabotage, assassination and guerrilla warfare. But because their methods were covert, the profession was eventually deemed dishonourable.
They became much more popular between the 15th to 17th centuries and were essentially used as hitmen. But after Japan was unified, ninjas faded out and became part of folklore.
But because ninjas have been etched into Japan's history, many tourists travell to the country wanting to see them perform their famed skills.
The only problem is, there is a shrinking number who can live up to the hype. Takatsugu Aoki, manager of a martial arts squad, told the Asahi Newspaper: "With the number of foreign tourists visiting Japan on the increase, the value of ninja as tourism content has increased.
If you want to be considered for the job you have to be proficient in unarmed combat, throwing stars and swords, acrobatics, first aid and making yourself seem invisible.
Now, if you're not skilled in these practices, fear not, there are several places in Japan which can bring you up to speed.
According to The Independent, the towns of Nabari and Iga will give you the full ninja treatment. You'll get to climb over massive walls, throw deadly darts and other cool shit.
Once you get your certificate you can also learn how to sneak up on a person and strangle them - although that sounds a bit intense.
Two more locations have opened up since 2015 hoping to train the next generation of ninjas.
Last year there was a big surge in applications for the Tokugawa Ieyasu and Hattori Hanzo Ninja Squad. More than 200 people signed up from 40 different countries compared with just 35 Japanese locals. However, there has been a sharp decline in the number of people putting themselves forward for this year.
So if you've been looking for an excuse to dust off that black outfit, well maybe it's time to show off your skills.