(CNN) A Japanese pop star who was stabbed dozens of times by an obsessed fan-turned-stalker is suing the government for not doing enough to protect her.

Mayu Tomita filed a lawsuit at the Tokyo District Court on Wednesday, demanding 76 million yen ($701,400) in damages from three parties: the Tokyo Metropolitan Government, her former agent, and her attacker.

Tomohiro Iwazaki, 20, is seen inside a police vehicle in Tokyo, Japan, on Monday, May 23, after being arrested for a knife attack on Japanese pop star Mayu Tomita as she was waiting to appear for a concert.

In 2016, Tomita was stabbed 61 times outside a building where she was to hold a live performance. She has since suffered from poor eyesight and post-traumatic stress disorder, according to her lawyer, Masato Takahashi.

Before the attack, Tomita told police she had received 140 comments from Tomohiro Iwazaki, including death threats, after she rejected his marriage proposal and returned his gifts including a watch and books.

Takahashi said the crime could have "easily been stopped" if Tokyo Metropolitan Police had taken sufficient action.

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