Sapphire Skulls
From Aozora Wiki
The Sapphire Skulls (サファイアスカル, Safaiasukaru) are a mixed punk rock and heavy metal band founded in Japan by Matthias. Initially a one man project led by Matthias alone, three more members would join the band in the years following, and much later into their career, the final member and sole female of the group would join.