By Katie Atkinson
October 14, 2013 at 12:00 PM EDT

These kids officially have the coolest teacher ever. Remember Charlie’s musical The Nightman Cometh on It’s Always Sunny in Philadelphia, which the gang took on the road back in 2009? Well, these Japanese kindergartners certainly do.

A video, which was posted on YouTube in August and just went viral, has eight schoolchildren singing Charlie’s epic “Dayman” song — which works surprisingly well as a kids’ song, considering the show’s typical content. Their pantomimes for “karate and friendship for everyone” are especially adorable.

Check it out below:

And just in case you forgot the episode, here’s where Charlie and Dennis bring the “Dayman” song to life: