Short answers, pulled from the story.
Livedoor was founded by Takafumi Horie, known in Japan as "Horiemon." He was arrested in January 2006 on charges of securities and accounting fraud, sentenced to two and a half years in jail on the 16th of March 2007, and later published an autobiography titled Complete Resistance proclaiming his innocence. In February 2022, he became executive advisor to livedoor.
The Tokyo Stock Exchange delisted Livedoor on the 14th of April 2006 after the company lost 90 percent of its stock value in four months following a criminal investigation into securities law violations. The investigation began with prosecutor raids on Livedoor offices and executives' homes on the 16th of January 2006.
South Korea-based NHN Corporation purchased Livedoor in early 2010 for a reported 6.3 billion yen. The Livedoor ISP and blog services were later operated by Line Corporation from 2012 through 2022, before Livedoor was sold again in 2022.
Japan passed legislation modelled on the American Sarbanes-Oxley Act, nicknamed J-SOX, on the 14th of June 2006, specifically to prevent a recurrence of the accounting failures the Livedoor scandal exposed.
A class-action suit by 3,340 individual investors resulted in a final ruling of 7.6 billion yen against Livedoor. Fuji Television also sued for 35 billion yen in March 2007, and additional suits produced at least one further judgment of 4.9 billion yen. Livedoor sued its own executives in turn, with founder Horie settling for 21 billion yen.
In September 2004, Livedoor founded a team called livedoor baseball and applied to base it in Sendai, Miyagi Prefecture. The bid failed because Rakuten, a Japanese e-commerce company, won the right to place a franchise there; that team became the Tohoku Rakuten Golden Eagles and began play in 2005.