Ninja will help boost in Japan in the run-up to the 2019 Rugby World Cup and the 2020 Tokyo Olympics. Ninja are a of Japan. The dark-clothed
, who are great at fighting and can run across
at great speed, are
worldwide. Several ninja showed their on Wednesday. A group of them "sneaked" into the of Japan's Prime Minister. This was the start of the tourism . The Prime Minister joked with the ninja. He said: "Even though you're all wearing such colors, you were still able to slip through the tight of my office."
A ninja was a secret , spy and fighter, which first appeared in 15th-century Japan. He or she was a . They were skilled in assassination, , infiltration (getting into an area or building), sabotage and spying. They helped warlords win land and . In the 19th century, and writers surrounded them in . They gave ninja great abilities, such as , walking on water and being able to control the elements. Today we see them - in movies, cartoons, comics, games and manga.