Help me find this manga

So, a while back I read this yaoi about a boy who really liked to draw going up to the rooftop at school. He finds a guy on the rooftop wearing a summer school uniform. He falls in love with him and wanted to draw him. So he goes into the art classroom to find that there was already a drawing of him. The sensei tells him that a student who died. Please, I need to read this again.