nationality: malaysian
age: 21
worst problem encountered: examination (studies during high school was extremely stressful)
have you ever thought of committing suicide as a solution to a problem? No.
why do you think suicide crosses people's minds?
Since you're researching on Japanese, as an Asian myself, I say is the society's mentality. As Asians, we are often pressured (or self-imposed) to get good grades/do well/ succeeding is vital, failure is well, not an option, if you failed in terms of studies, you don't get good education, and perceived not to succeed.
When I attended a student exchange program to Japan, I lived with two families, both have three kids, but one family, has kids my age, 16-21 years old and the other one, 3-6 years old. What I noticed, indeed suicide has been a great concern, and it's a taboo- also it has to do with the open minded-ness of the families. The family with older kids i noticed doesn't have computer knowledge, they don't go online as well- which I think I remembered my host father told that he didn't encourage them to use it- prolly from the fact that internet/group suicides are common in Japan.
Opposites of the first family, the 2nd family with younger kids uses the internet, doing classroom assignments and even chatting.
I think the exposure plays an important part. I come from a country that has strict Muslim laws, even stricter than Muslims majority countries such as Saudi Arabia or Istanbul where it's know to be less conservative than us. It's really how the government, the society, the community, the parents educated young children from start.
So there you have it, my two cents. I hope that helps.