[18] On June 12, 2023, Hyakuta declared that if the LGBT Understanding Promotion Act, which was still being discussed and debated in the National Diet, were to pass, he would run for the Japanese House of Representatives and form a new political party.

[20] Consequently, he announced the formation of the Conservative Party of Japan on September 1, 2023 with Nagoya Mayor Takashi Kawamura as its Vice President and journalist Kaori Arimoto as its Secretary General.

[27] Hyakuta wrote a book called Jun'ai (2014) in memory of his recently deceased friend, the radio and TV show host Yashiki Takajin.

The book, written as if it were a work of reporting, portrayed Takajin's daughter and his manager as callous, cruel individuals who abandoned him in his final days.

[28] After multiple appeals, in December 2017 the Supreme Court of Japan found that Hyakuta had slandered Takajin's daughter and ordered 3.65 million yen paid in compensation.

[29] In November 2018 the Tokyo District Court found that Hyakuta had slandered Takajin's manager as well, ordering an additional 2.75 million yen in compensation and a written apology.

[30][31] His 2018 book Nihon Kokuki (日本国紀), hailed by the publisher as "the ultimate overview of Japanese history",[32] was discovered to contain fictitious statements as well as plagiarism from sources such as Wikipedia articles,[33] the latter being admitted by the author himself.