Prosecutors indicted a 42-year-old man Wednesday over an arson attack in July last year on a Kyoto Animation Co. studio that killed 36 people and injured 33 others.

Shinji Aoba, who was arrested in May for perpetrating one of Japan's worst mass murders, has likely been determined by medical experts to be mentally competent based on his calculated actions, such as purchasing gasoline prior to the incident, meaning he can be held criminally liable for the attack.

The company, often referred to as KyoAni at home and abroad, is known internationally for producing many popular animation works such as "K-On!" and "The Melancholy of Haruhi Suzumiya."