A controversy has broken out on social media after the name of a high-profile youth activist appeared last week on the list of artists attending this year's Fuji Rock Festival.

The unexpected name: Aki Okuda, a leader of the Students Emergency Action for Liberal Democracy-s, better known as SEALDs.

SEALDs is a group of young people aligned against the security laws enacted last year after Prime Minister Shinzo Abe declared a new take on the government's long-held interpretation of the Constitution, sidestepping war-renouncing Article 9 to expand the legal scope of the Self-Defense Forces' missions abroad.