Kamiji and Montjane put in a dominant display 6-1, 6-2 over the home hopes to return to the doubles final. Last season's runners-up will take on Diede de Groot and Argentina's Maria Florencia Moreno for the title.
"It's our second Roland-Garros, our partnership is still new. So, we're still working on our relationship on court, talking to each other better," said Montjane. "But we are just happy to have made another final."
Meanwhile, Kamiji also has the wheelchair singles final against perennial rival de Groot. The top-ranked duo have contested the past four Grand Slam finals, with the all-conquering Dutchwoman lifting all four trophies.
"It's a challenge for me, of course I want to win. Here's my favourite Grand Slam. I really want to win and here's many supporters living in Paris, some Japanese people," said four-time Roland-Garros singles champion Kamiji, most recently in 2020.
"I really want show them that I am happy and I can play put a good performance. Yeah, just I just give everything for Saturday."