Common question is you wanting to see more of that girl who appeared, sometimes its very simple but most of the time its more difficult than you think, I think the beauty of FC2 vids is that often the majority are real amateurs as opposed to Western pornstars who appear in 100 videos (nasty)
This is where you need a translator handy, sometimes the studio will put the girls either full stage name OR the first name in the title (this really depends on the studio, I find most of the time they wont bc again these girls are actually amateur). Another route is to scroll down the video page and the studio MAY put basic info about the girl, like age/name/hobbies. This used to be very common but nowadays - not so much. The easiest and fastest is if the girl had already appeared in previous videos - chances are the studio will link that video in the description (cause they want you to check it out and buy it ofc), so be sure to check the description box below the usual previews.
Another route is (and one I use) is this lovely archive site (there a few other more others I am blanking out on) -
https://beauty.millionshot.net/list/
In the search box in the right top corner, enter the FC2 code I talked about above and IF the site did manage to archive/create a profile, it will show up and a list of the videos that girl had appeared on (like if they had appeared for other studios - this is clutch bc often different studios will use diff names for the same girl , pain in the ass).
Another route is to go to
https://fc2cm.com/ this is archive site, search video code - it will bring up the video and the studio (which may be defunct) - you will be able to see all the deleted "videos" - take the code for each and find a stream elsewhere. My personal gripe is that the site blurs the preview images making search a bit more difficult/annoying - but im sure its to prevent closure.