For some children, the thought of returning to school sends their stress levels soaring, as they battle fears ranging from schoolyard bullies to doing poorly on exams.
"Going back to school creates anxiety," said Kuniyasu Hiraiwa, representative director of AfterSchool, a non-profit that helps parents detect early warning signs in kids.
Japan -- which places huge emphasis on academic success -- has the highest suicide rate among the Group of Seven (G7) industrialised nations, with more than 20,000 people taking their own lives annually.
Some 500 Japanese under 20 years of age kill themselves each year. The teen suicide rate on September 1 tends to be around three times higher than any other day of the year.
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This week, popular actress Shoko Nakagawa posted the message "Never die. Live" on Twitter, while public broadcaster NHK created the hashtag "On the night of August 31st" to draw attention to the problem.
Singer YuYu Horun, who said he tried to kill himself in primary school, now reaches out to adolescents who feel alienated at home.
"Many children do not feel love from parents who often do not give it because they did not get it themselves. In many families, communication is insufficient."
Some libraries are urging frightened children kids to take refuge behind their doors, while Tokyo's Ueno Zoo said at-risk students should be allowed to skip the first day of school.
Tweeting a picture of its tapirs, the zoo said scared kids can run away without asking for permission -- just like the animals when they are confronted with danger.
Authorities have ramped up their vigilance, urging schools to be alert for danger signs among students, while the government set up a 24-hour telephone counselling service that children or their parents can call for assistance.
"I urge them to talk to someone -- family, school teachers, friends or anyone -- about their problems," education minister Yoshimasa Hayashi said Friday.
"If it's hard to talk to people around them, I want them to consult with the education ministry's service.