More people died of suicide in Japan in one month than the entire coronavirus pandemic
That is because very few people in Japan have died from the pandemic. Only 2042 so far. The number of suicides has not increased, as far as I know. On the contrary, in recent years, roughly 30,000 people in Japan commit suicide, so the rate may have fallen this year.
That rate is a little lower than the U.S. Experts say suicide is more common in the U.S. because guns are widely available.
Your comparison is meaningless. 3,000 people in Japan died last year in automobile accidents, but that has no connection with COVID-19, and comparing it is comparing apples to oranges.