According to local media reports, the 41-year-old told police he planned the deadly blaze after the company stole his novel.
A witness told reporters that he “seemed to be discontented, he seemed to get angry, shouting something about how he had been plagiarised”.
The blaze in Kyoto is the worst mass killing since a suspected arson attack in Tokyo killed 44 people in 2001.
It is believed the suspect shouted “die!” as he poured a liquid, believed to be petrol, around the studio.
The blaze broke out at 10.30am local time on Thursday and was fully extinguished at about 6.20am on Friday.
Officers said the suspect was not a company employee but gave no further details.
More than 70 people were in the three-storey building at the time – and 10 people remain in a critical condition.
Of the 33 who died, 19 were found on a staircase leading up to the roof from the third floor, with authorities telling the Kyodo news agency that their bodies were found piled on top of each other.
The victims may have rushed up the stairs to escape the blaze on the lower floors, only to find that they could not open the door.
None of the victims’ identified have been disclosed, but locals suggested many of those who died would have been in their 20s.
Two cans, a rucksack and a trolley were found near the site, and television footage appeared to show five long knives being laid out by police as possible evidence on the ground outside the building.
Little else is known about the suspect, who is under police supervision with serious burns to his face and legs.
New Zealand speaker feeds colleague’s baby during debate | World News
Trevor Mallard tweeted a photo of himself feeding MP Tamati Coffey’s newborn son while in the speaker’s seat on Wednesday.
He captioned the picture: “Normally the Speaker’s chair is only used by Presiding Officers but today a VIP took the chair with me. Congratulations @tamaticoffey and Tim on the newest member of your family.”
The images have since been shared and liked hundreds of times, with many commending Mr Mallard for taking on the babysitting duties.
One Twitter user said: “New Zealand….you might be a small country, but you have a huge lesson to teach the world! Great photo!”
While another said: “This is something wonderful that is just a pleasure to see happening in our parliament.”
Mr Coffey’s son was born via a surrogate to him and his partner Tim Smith in July.
Other MPs also hailed Mr Coffey for bringing the baby into the parliament chamber and shared an image of him holding his son.
Green Party MP Golriz Ghahraman tweeted: “Who needs to see this today? Every single last one of us, that’s who. Here’s a brand new papa holding his new born in our House of Representatives right now.”
“Lovely to have a baby in the House, and what a beautiful one,” said fellow Green Party MP Gareth Hughes.
Last year, New Zealand’s prime minister Jacinda Ardern made history by becoming the first female world leader to bring her baby to the United Nations general assembly.
And in the UK, leader of the Liberal Democrats Jo Swinson cradled her baby on parliament’s green benches in January, in what was thought to be a first during a Commons debate.
However not all countries have the same outlook about allowing babies in parliament.
Kenyan politicians walked out in protest earlier this month over a decision to eject their colleague who was holding her five-month old baby during a session of the legislature.
Zuelekha Hassan Juma was ejected from the floor of the National Assembly with the child.
Christopher Omulele, temporary speaker of the National Assembly, said: “As much as she might want to take care of her child, this is not the place for it.”
Vladimir Putin warns US over missile test: ‘We will react accordingly’ | World News
The missile test on Sunday would have been banned under a now-defunct arms treaty.
The Pentagon confirmed it tested a modified ground-launched version of a Navy Tomahawk cruise missile, which hit its target more than 310 miles (499km) away.
It follows the pull-out of both Washington and Moscow from the 1987 Intermediate-range Nuclear Forces (INF) Treaty, which prohibited the use of such weapons.
The Russian president spoke after talks with Finnish leader Sauli Niinisto on Wednesday.
Mr Putin argued that the quick test indicated that America had begun working on the missile long before declaring its intention to abandon the pact.
The Russian leader said the test signalled “the emergence of new threats, to which we will react accordingly”.
“The Americans have tested this missile too quickly after having withdrawn from the treaty,” Mr Putin said.
“That gives us strong reason to believe that they had started work to adapt the sea-launched missile long before they began looking for excuses to opt out of the treaty.”
The US said it withdrew from the treaty following Russian violations, which Moscow denies.
Mr Putin said his country would work to create similar missiles but reaffirmed that it would not deploy missiles previously banned by the treaty to any area before the US does.
Italian PM To Resign Amidst Crisis
Fourteen Months after the anti-establishment Five Star Movement and the League Party of anti-migrant politician, Mateo Salvini, formed a coalition to govern Italy, Giuseppe Conte, an independent chosen to serve as Prime Minister by the political partners, told the Italian Senate Tuesday that he will resign his office as head of government.
Conte said Salvini was irresponsible, the BBC reports.
Conte, whose popularity had been trumped by Salvini’s policy towards migrants crossing the Mediterranean, accused him of ‘creating a new political crisis for Italy for personal and party interests.’
Salvini had earlier tabled a vote of no confidence on Conte’s time as Prime Minister.
“I take this opportunity to announce that I will present my resignation as head of government to the president of the republic,” Conte informed the Senate.
The outgoing prime minister said Salvini’s actions were driven by the success of his party at the European parliament elections.
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