Police reported the suspected abuse of a record 80,104 children last year, according to government figures released on Thursday, up almost 25% from the previous year. Experts attributed the rise to growing public awareness of the issue in the wake of several high-profile cases.

Japanese welfare officials and police have traditionally been reluctant to investigate allegations of child abuse and domestic violence. Social workers complain they are under-staffed and lack the powers to intervene to protect children when confronted with uncooperative parents.

Mia’s death, however, prompted experts to call for drastic changes in the way authorities investigate child abuse, including closer cooperation between the police, teachers and welfare authorities.

“People must recognise that child abuse is a very serious matter that cannot be dealt with by one organisation alone,” Keiji Goto, a lawyer, told public broadcaster NHK.

The prime minister, Shinzo Abe, vowed to eradicate child abuse in response to Mia’s “heart-wrenching” death. “We failed to respond to the call for help that she had courageously sent out,” he told MPs this week. “As a government, we take that seriously.”

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