Japanese police have identified the detained suspect as Shinji Aoba but he has not yet been arrested.
Media reports say the 41-year-old man seemed angry and shouted "Die!" before he poured a flammable liquid on the entrance to Kyoto Animation headquarters and set it ablaze on Thursday.
The suspected arsonist shouted that he had been plagiarised and had reportedly planned the attack on an animation studio.
The fire was put out nearly a day later, killing 33 people and injuring 10 others in Japan's worst mass killing since 2001.
Japan's Kyodo news agency reported that when the suspect was detained, he confessed to the police and claimed the studio had stolen his novel.
Russian ballistic missiles kill at least five in Ukraine's Kyiv, spark fires
Kenya tourist helicopter crash kills seven
US, South Korea to cut length, scope of military drills after Trump order
Central African Republic gold mine collapse kills at least 100
Israeli airstrike kills nine Palestinians at Gaza police station
