Kozo Yamamoto, a MP from the Liberal Democratic Party (the main ruling party), mentions to BIG as he was interviewed by an internet news. The Net IB News published the interview with Mr Yamamoto on 6 February 2015. The interview is about how far he has been influential for so-called ‘Abenomix’, the current government’s flag ship economic policy which is a mixture of financial easing and deregulations, and what is to be done next. In its 6th page, Mr Yamamoto briefly referred to ‘a basic income’. Although its usage rather loose and not exclusively unconditional BI, it is one of rare cases of mentioning BI among MPs from LDP. The interview is in Japanese:
https://www.data-max.co.jp/politics_and_society/2015/02/29918/0206_ymh_06/
And what does he says???