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https://www.sangiin.go.jp/japanese/joho1/kousei/eng/members/profile/7012005.htm
Mr. YAMADA Taro Liberal Democratic Party
Current Responsibilities in the House of Councillors
Committee on General Affairs
Special Committee on Consumer Affairs
2012 first elected to the House of Councillors
2021 Parliamentary Vice-Minister for Digital Agency
2021 Parliamentary Vice-Minister of Cabinet Office
Practically speaking, the LDP is a very dominant party, so it's unsurprising it would involve them.
As someone pointed out:
"In addition to standing against censorship of media, Yamada also focused on issues such as internet privacy and freedom of expression on the internet."