if you want a real challenge, try reading kyoka izumi's short stories. he's also the best japanese writer i've encountered so far (and i've read many). very famous in japan, most people have at least heard of him, but for some reason completely unknown in the west. he's been compared to e.a. poe for his stories of ghosts and macabre phenomena, but a) kyoka's stories are much more narratively complex and b) they are written in a more modern, purely visual way (kyoka's writing was influenced by early cinema techniques, such as editing).
an example of his more conventional and simpler tales is famous 高野聖, while 春昼/春昼後刻 is one of his best and most diffucult.
an example of his more conventional and simpler tales is famous 高野聖, while 春昼/春昼後刻 is one of his best and most diffucult.