I think it's relevant to consider the historical Japanese view toward suicide--quite unlike many Western cultures which view suicide as despair, as giving up, as selfish, and always the worst choice.
While the public facade in Japan, too, condemns suicide (as do certainly the train lines, which levy a fine upon any suicide's family if the trains are delayed due to someone's flinging themselves upon the tracks) one must consider how it is characterized by tradition, literature, and even popular media: Namely, romanticized, even at times noble.
This is a country which eats up with a spoon narratives such as Romeo and Juliet, Tristan und Isolde, or any number of other foreign products dealing with the topic sympathetically.
I'd agree, too, that Japan is probably lacking in its mental health services (an understatement, actually.)
Does anyone remember the woman a few years ago who set up a table somewhere in Tokyo with a lot of foot traffic--just to talk to people about their problems?
She was inundated with "clients" every day she set up the table.