A manga from like 1960s? That's what popped up when I search and I'm gonna say there's no luck finding those online. You gotta dig to even find physical copies. Actually the anime itself too, it's very OLD idk if you'll actually have luck finding it.
Look around this site
https://mangadex.org/author/707456e6-c896-4fa7-853a-1a1f898596a6/shirato-sa...... reply
