Ms Higashi is a key campaigner raising awareness of LGBT rights in Japan. She and her partner held the first same-sex partnership ceremony at Tokyo DisneySea, which drew massive public attention when she tweeted that she had been informed one of them would have to wear a tuxedo. The couple were the first to receive a same-sex partnership certificate from Tokyo’s Shibuya Ward.
Ms Higashi is also an author of four books which introduce public life as a lesbian to the Japanese. She is also the co-founder of the company Trois Couleurs, which aims to realise a 'diverse society'. Amongst other activities, the company runs an online community platform on Facebook for LGBT people to share their experiences and provides consultation for members.