Black Thunder is a famous Japanese chocolate bar made from the Yuraku Confectionery Company. It is made from a dark cocoa-flavored cookie bar mixed with Japanese-style rice puffs and coated with chocolate.
Many people know and love the usual Black Thunder chocolate bar, this version though is about double the size but half the thickness. Tagged as Deliciousness! Size! Double the lightning strike! (おいしさ！大きさ！ダブルイナズマ！) in Japan!
This is a must-have for any fan of Japanese chocolate!