While municipal elections in Japan don’t often get covered by overseas media, this year’s mayoral contest in Tokyo’s Suginami Ward was something different.

In a stunning upset, the city’s two-term mayor, Ryo Tanaka, was defeated by dark-horse candidate Satoko Kishimoto, 48.

As a woman contesting Japan’s male-dominated system, and with no party support or experience in public office, Kishimoto had little chance of winning. Nevertheless, she carried the race with a margin of just 187 votes.