Japan's far-right populist Sanseito party was one of the biggest winners in the weekend's upper house election, attracting many voters with its "Japanese First" platform.

A once fringe opposition party in Japan has become the fourth largest in parliament by pushing a nationalist "Japanese First" agenda.

Sanseito leader Sohei Kamiya's xenophobic views, antisemitic remarks and emphasis on Japan’s ethnic purity have raised alarms.