How to unlock last chapters of main story?

chapter 9 doesnt exist to get chapter 7 just beat igallta. to unlock the boss of chapter 7, full combo clock paradox (you don't need to full combo in HD/EZ) in the middle of the song, if you have full comboed the start a clock will appear. If it does, make sure to full combo the rest of the song. If the clock appears again, you proceed to the next song. The next song is chronostasis, you need to get an A rank and that's basically it. you then proceed to the next one. You have to get V rank on this song which may sound hard but its actually galaxiacion, the first level in legacy chapter so it will be easy after you finish galaxiacion with V rank, hold the screen to proceed the cutscene. After that enjoy Rrhar'il To get chapter 8's 2 bosses 1st boss: basically finish all songs from crave wave (unlocked by playing micro.wav after getting chapter 8), the chariot ~revival~ (unlocked by playing cereris in legacy chapter), and retribution. You will only proceed to retribution if you get S on The chariot revival. Finish retribution and you will get to the first boss destruction 3, 2, 1. After finishing destruction 3, 2, 1 go to chariot revival and you will notice that the jacket (thumbnail) for the song is up side down. Now you need to flip your screen up side down and you will unlock a new song, "luminescence" you have to do good at the start. If fireworks start appearing in the background at the end, that means you will proceed to the next song. The next song is literally retribution but with a different background. So just beat it to unlock the final boss of chapter 8, Distorted Fate. thanks for reading and i hope you progress and unlock through many songs in phigros.