As per their strict publicity policy, BABYMETAL do not remotely reveal their personal and private information. You may have heard about their interviews evading like “under the Fox God's oracle” or something. But not on the Japanese radio. This is one of the few Japanese local radio program interviewing BABYMETAL something personal successfully.

Note that BABYMETAL girls in real life are way different from their mysterious and charismatic stature on their stage: Ordinary Japanese teenagers not having the rockstar attitude at all. It may disappoint those who think a big part of the appeal of BABYMETAL is their mystique and mythology. Watch this video if and only if you are ready to take yourself to a whole new level of BABYMETALhead.

(Source)
FM NACK5 “～IDOL SHOWCASE～ i-BAN!!”
Guest #66: BABYMETAL (January 13, 2013)