Press photo for I Will Not Cry (私は泣かない), 1966.
Meiko’s on the far right. :)
On April 2nd, Japanese distributor Happinet will be releasing for the first time on DVD the film I Wanted To Meet And I Want To See You (逢いたくて逢いたくて), originally released in 1966. Meiko has a supporting role in the film alongside frequent co-stars Chieko Matsubara (松原智恵子) and Tetsuya Watari (渡 哲也). You can see her on the far left of the second image.
Check the tag for more images from the film.
You can pre-order the DVD at Amazon.jp.
Poster for Duel In The Red Valley (赤い 谷間 の 決 斗), released December 28, 1965, and close up of Meiko on it. The film was directed by Toshio Masuda 舛田利雄 and stars Tetsuya Watari 渡 哲也 and Yujiro Ishihara 石原 裕次郎 alongside the 18 year old Meiko Kaji (appearing under her birth name Masako Ota 太田雅子).
As far as I know, it was only ever released on VHS.
On February 4th, 2014 Japanese distributor Happinet will be releasing a newly remastered DVD of the film Zessho 絶唱. As you can see from that second image, it has a very, very young Meiko Kaji (under her birth name Masako Ota) in it.
It came out on September 17th, 1966, was directed by Katsumi Nishikawa 西河克己 and also stars Masako Izumi 和泉雅子 and Kazuo Funaki 舟木一夫.
The disc is Region 2 and without English subtitles. You can pre-order it from Amazon Japan now.