I'm surprised that it wasn't mentioned here, but
Hox made a
list of oneshot recommendations. Some of the titles included in the list have already been mentioned in this thread (like
Hotel and
Forever Honey). While I can't say that they're all good or moving (I've read them all save for the ones by
Kago Shintaro found in the separate list. Some titles are also comedy.), the list is definitely worth your time.
Allow me to add
L∞P to your list of titles. You might also want to check out
Kitoh Mohiro's compilations, though his work might be a bit of an acquired taste haha.