Comment by jeffchien

If you get stuck there between ~10PM (the last train back to Hachioji that could connect to Shinjuku) and 11PM (or midnight if you can spare the change for the limited express), you can also consider going west to Yamanashi and Kofu. Let's just say that I was almost in this exact scenario from a long day in Kawaguchiko, but I ended up making it back to central Tokyo.