Hokuto Ga Gotoku - Shin Boss Battle - No Damage, Hard Difficulty / NO NG + (NO BGM WTF)

First boss fight in the game. NO MUSIC. I don't know the reason, i tried 3 times with a different account, but nothing. Anyway, all boss fights in the game ( includes secret bosses ) might take awhile without taking any damage, because i will do every boss fights on EX Hard. Moreover, I don't have much spare time, except sunday lol.