The source doesn't say if this is an original illustration so i didn't tag it here. If someone knows where it is from or if it is an original pls edit and tag it.
It's titled "Daikanyama Elegy", so I think it's just art they did of that area of Shibuya in Tokyo.
P.S. That cat has a rain coat ooooooooon.
P.S. That cat has a rain coat ooooooooon.