A Japanese university student has received a full grade after she handed a blank paper to her teacher who had been asked to write a research essay, The Independent newspaper reported.
The paper said that a professor at the University of "Me" realized that the first year student in the history of ninja Amy Haga, who handed her blank paper, had written it entirely by the invisible secret ink.
In her "secret" or "invisible" essay, Amy Haga turned to the Apuridashi technique of ninja fighters, who were famous for their covert operations.
So when University Ninja History Professor Yuji Yamada asked her to write an article about a visit to the Ninja Museum in Egaro, the 19-year-old Haga decided to do so in a way that reflected her passion for everything about the ninja.
"When her teacher asked that he give a high degree of creativity, she decided to make her article stand out from the others, so I decided to use the Aporidashi technique," Haga told local media.
Aporidashi, a traditional Japanese technology used to exchange secret correspondence in the past, relies on soaking and crushing soybeans to make ink only visible when it is near a source of heat.
To make sure that her teacher would not miss the secret text, Haga included her essay in a note asking him to "heat the paper."
"I have seen such reports written in code, but I have never seen them in Aporidashi technology," said professor Yuji Yamada. The media wanted to take a picture. "
True ninja fighters, not those shown in movies and cartoons, were spy agents practicing ninjutsu, a type of guerrilla warfare dating from the feudal period in Japan, but the ninja arts practiced in modern Japan faded.