The swordsmith, whose social media profiles bear the name Masanari or Yoshihiro Kudo, makes traditional Japanese swords known as katanas in Kiryu City, Gunma prefecture. Kudo last week tweeted a link for candidates interested in joining his shop as an apprentice to learn the ancient art, but his post quickly went viral when jobseekers discovered the startling terms of the position. 'Training from 8:30 to 18:30 - this is voluntary training by the disciple himself, not employment, so it is unpaid,' the advert read. 'Please prepare breakfast and dinner, work clothes, etc, by yourself... Originally, I wanted to provide a ''live-in'' training environment like the one I experienced, but due to housing issues, I regrettably have to commute.'