You can get quite far without being able to read Japanese. Some of the cultural allusions may not make sense (like the Chono surrogate), and it may be a bit obscure what to do to make the story advance, but it's doable. The ending is probably the most inscrutable for Westerners without being able to read what's going on, but it eventually makes itself clear.Its dead? D: Im waiting for so many years now x~x