Please help!!

I'm looking for this bl manga that I read a while ago. It's about this guy (let's call him person A) who passes out I think from lack of eating and then Person B picks him up and takes him to his room and when Person A wakes up he sees person B and gets scared/startled because person B is dressed in all black and his face was covered with his long hair. Later on there was also this scene where they both went to a heavy metal concert because Person B likes listening to heavy metal.

Sorry this is the best I could explain it. Please help if you think you know the name!! ┗( T﹏T )┛