Please help me find this manga!!

Is this about this guy who is in photography club in high school. The culture festival is coming up and he need to have a photo to be displayed or something. When he was looking around and went to rooftop he saw this guy on the railing to him, his back to him. Without thinking he took picture of him. I don't remember after that. To what I remember is that the photography guy is a transfer student and he ask around about the guy on the rooftop (probably asking permission to him about his photo to be displayed at culture festival) but wherever he goes he been told to let him be or something. It turns out the guy has a twin who commit suicide on that rooftop.