Kadokawa, which is known for producing anime and publishing books including manga comics, said last month that Sony had made an approach to the firm, sending the media firm's stocks soaring.
On Thursday they said in a joint statement they had signed a "strategic capital and business alliance agreement".
The new deal will see Sony pay 50 billion yen ($320 million) for 12 million new Kadokawa shares, making it the company's biggest shareholder.
The transfer to Sony, which has already held a stake in Kadokawa since 2021, is due to take effect on January 7.
The move will expand Sony's games and cartoons portfolio, after its 2021 purchase of Crunchyroll, a once semi-legal US-based sharing site that is now a streaming giant for Japanese anime.
Kadokawa and Sony "historically have collaborated on various projects, and through this capital and business alliance, intend to further strengthen our collaboration to maximise both companies' IP value globally", the statement said.
Kadokawa also owns Tokyo-based FromSoftware, the creator of the dark fantasy role-playing adventure game "Elden Ring", which was developed with help from "Game of Thrones" author George R.R. Martin.
Sony said last month that its net profit jumped in the second quarter thanks to stronger sales in gaming, music and imaging sensors.
Its PlayStation 5 Pro console hit shelves in November, but its price tag -- 799.99 euros ($847) in Europe -- has raised eyebrows among gamers.
tmo/dan/fox
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