Unknown (Taratsumi John) summary:

From Bunny's Scanlations and Must Be Endless:One day, up-and-coming young photographer Franz Schumann makes a fateful encounter. A beautiful young man with jet-black hair, eyes that show traces of a fresh grief, white skin like porcelain that, though it’s decorated with numerous bruises, is still sublime: Jay. He won’t tell the whole story of where he’s from, and Franz, wanting to keep the mysterious Jay as his exclusive model, as time passes, begins to fall in love with him...