Yamato Tanooka was discovered alive and well early today after spending nearly a week sheltered alone on a military base just a few kilometres from where he was forced out of the family car for misbehaving.
While views outside Japan persist of a hard-working people raised under a tough samurai-style discipline, the reality is far more nuanced.
As in much of the developed world, Japanese parents too have become more indulgent towards their children in recent decades, to the point that older generations complain the country has gone soft.
And though there was a national sigh of relief after the boy's rescue, opinions remained harsh.
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"Missing boy was found and that's all wonderful, but the parents must be disciplined such as being abandoned on an uninhabited island," read a Japanese-language tweet.
The father, Takayuki Tanooka, admitted that what he did was wrong, apologising in front of reporters after being reunited with his son, and decrying his own action as "excessive".
Among the most notable opinion leaders critical of the parents was prominent education expert Naoki Ogi.
"The parents who put him in this situation must be harshly condemned," Ogi wrote earlier this week on his widely followed blog.
"Surely, they will be arrested soon," he added.
But he also said that many adults had told him they too as children were abandoned by their parents as a form of punishment.
While many social critics, television personalities and others have condemned the parents, some were quick to sympathise over frustration related to child-rearing and discussed their own experiences of tough parental love.
"Should we call all forms of strict disciplining abuse?" said one tweet.
"If you were his parents, would you never keep a distance from your child or even abandon them?
"This case could be a chance to think about how we engage with children.