BBC has released a documentary about BABYMETAL and Japanese pop-culture as a whole.
The documentary sees presenter Dev Griffin attend the band's concert at London's Wembley Arena, their biggest show outside of Japan.
To find out how Japanese bands can become so big in the UK, Dev travelled to Tokyo - where he met J-Pop idols, learned about kawaii fashion, had a wild karaoke night with the band Ladybaby and explored the Japanese rock scene with Crossfaith.
"Japanese bands are totally different from Western bands," explained Crossfaith frontman Kenta Koie. "BABYMETAL - they mix metal music and kawaii stuff."
"And we sing in English, but at the same time we put electronic music with heavy music," he continued. "We mix them up. So that's the reason why Japanese bands are getting popular in the UK, I think."