I know this is an old comment, but I'm currently rewatching garo... Women can use soul metal... But looks like there are conditions, kaoru (possessed with Messiah) and glum used soul metal near the end of the first season... As to the actual condition, it's never stated, I would chalk it down to being partly horror at that point though. Im not sure about this stage though, my Japanese is not good enough to follow the story here XD
@@Frankie1622 Anyone with the proper training can wield soul metal; females can't be knights so they don't usually have that training but a female who wanted to be a knight (Rekka) could undergo the training and wield soul metal. It's never been a part of the lore that they couldn't. I'm the Togune Flute Rekka uses a soul metal dagger, you can look it up on the wiki. They even have a gif of her taking it out. Yuna never had the training to wield soul metal, hence why she has to use magic to use her father's sword.