So was I, but the other responder is actually right, it's lower than US and "After peaking in 2003, suicide rates have been gradually declining, falling to the lowest on record (since 1978) in 2019."

https://en.m.wikipedia.org/wiki/Suicide_in_Japan

Japan is notorious for recording things as "accidents" that are not accidents. Especially if it helps the police or family save face. This also applies to other things, like an artificially low homicide rate.

If you use that metric to judge happiness, it looks like homeless people are twice as happy as people living off of interest/dividends/rent.

Survivorship bias perhaps?

It's a stereotype just like the long hours - Americans work around 10% more hours annually nowadays.

It's actually in decline and lower than in the US.