An Honest Iyami is Dangerous!

Osomatsu-kun – Season 1

After Iyami's dishonesty spurs trouble for Dekapan's Restaurant, the Hatabou Research Institute creates an explosive lie-detector belt that's forced onto the serial liar. But when Iyami gets the town into warzone-level trouble for his honesty, Dekapan must stop the danger he has inadvertently caused.