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A Japanese pupil of ninja history who handed in a blank paper was given top marks – after her teacher realised the essay had been written in invisible ink.
Eimi Haga adopted the ninja technique of “aburidashi”, spending countless hours soaking and soybeans that are crushing result in the ink.
The text appeared when her teacher heated the paper over their gasoline kitchen stove.
“It is something we discovered through a guide once I had been little,” Ms Haga told the BBC. “I just hoped that no-one would come up with similar idea.”
Ms Haga was enthusiastic about ninjas – covert agents and assassins in medieval Japan – since watching an animated tv program as a kid.
The first-year student took a class in ninja history, and was asked to write about a visit to the Ninja Museum of Igaryu after enrolling at Mie University in Japan.