Presiding judge described the crime as 'extremely malicious'
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Incident took place after the mayor refused to pay what he felt was an inflated bill, police said
Mayor came to Hiroshima to participate in the opening of the Hiroshima Peace Memorial Ceremony on Tuesday
Suspect reportedly threatened via telephone, 'I will carry out a Kyoto Animation-type attack in which I ignite gasoline,'
Suspect told police, 'I did it after becoming irritated from studying'
Boy suffered injuries that are not considered life-threatening, police said
There were no customers present, police said
Suspect told police, 'Since she was my type, I got turned on and touched her'
Examination of the body of the boy showed signs that he attempted to fight off the attack, police said