does he hate his bandmate with black hair?
i'm not sure...
all i can remember is that the cover is the bottom (with the top i think ????) and blurred city's lights as the background
Maybe you can find from here?? If the band was significant for manga someone must’ve tagged it http://www.mangago.zone/tag/Band/
i think i found something similiar^^ the title is 'Pink Heart Jam'
it's that ^^ thank you all so much
can't remember the name of the yaoi, but the bottom has black hair with a blonde undercut and plays in a band
i think it's still ongoing