You would not want to cross this "young grasshopper" in a fight.
In the video above, 7-year-old Mahiro shows off her skills in Shotokan, a style of Karate. It's quite intimidating, but we trust Mahiro will use her black belt wisely.
CORRECTION: This post previously described the practice of Kanku Dai as a karate style. It is more exactly a "kata."