Pure Japanese

Tateishi is devoted to Japanese culture. He is in charge of sound at the ninja show at the theme park, but he keeps daily training with a bamboo sword at the shrine.One night, at the bar he is forced to take a test by local yakuza. The kit called "Pure Japanese" that measures the purity of being Japanese. Tateishi refuses to take it there, but when he uses the kit at home, the result shows 100%...