Here’s Wikipedia page and article about former Olympic long-distance runner Akemi Matsuno, who was elected to the Upper House from Kumamoto “as a Nippon Ishin (Japan Innovation Party) candidate in the proportional representation system.” Though the article quotes her as saying that she wants “to tell the LDP: You’re wrong,” the Japanese Wikipedia page about her says she’s in favor of changing Article 9 (renunciation of war) in the constitution.

https://en.wikipedia.org/wiki/Akemi_Matsuno

https://www.asahi.com/ajw/articles/14667017