Some Japanese Style Venues below.
・Happo-en(八芳園)
https://www.happo-en.com/banquet/
・Chinzansou(椿山荘)
https://hotel-chinzanso-tokyo.com/banquets_meetings/
・Meiji Kinenkan(明治記念館)
https://www.meijikinenkan.gr.jp/english/partymice/
・Forest Terrace Meiji Jingu
https://www.meijikinenkan.gr.jp/forestterrace-en/
And other unique venues in Tokyo↓