The 20-year-old was stabbed more than 20 times in the neck and chest with a folding knife by an obsessed fan. She collapsed during the incident and was rushed to a nearby hospital, where she has yet to regain consciousness, according to reports.

Tomohiro Iwazaki, 27, was arrested by police officers after he was identified by eyewitnesses. He admitted to the attack at the scene, police representatives have said. He reportedly told them he lost his temper when she refused a gift he had sent.

Tomita had previously reported Iwazaki to the police for bombarding her with messages on her blog and Twitter account.