You're quite welcome.
Here is a link to Sinapse's book. I bought mine years ago, so I hope this shop all still works. Otherwise I think the guy is stills semi-active, you might try e-mailing him if there is a problem.
https://book.attractionjapan.com/japan-game-book
If you are just in Japan for a few days and looking for a hookup, Bumble is probably your best bet in terms of apps. Other apps are better but require more time investment and Japanese skill. Perhaps Tinder if you are high spec and look it.
If you don't mind approaching then approach away. I advise against the lost gaijin approach though it /can/ work in some contexts. Just open with comments and maybe non-personal questions on things they are wearing etc. Has worked well for me. If they are interested they will ask back with obvious questions such as "where are you from?" etc. Even basic Japanese will help here but an interested girl will try hard at English to talk with you. An uninterested one will ignore you no matter what language you use. Sadly most people are still wearing masks everywhere and I have no advice on how to sort the wheat from the chaff. Either gamble it or confine your approaches to eating establishments I guess.
Bars are good, HUB seems to be coming back now they are less corona-nazi. Public Stand another good one. Early to midweek women/men ratios are better but sometimes you'll get lucky on a Fri or Sat. Otherwise walk around drinking areas, try random places that look good from the outside, that the crowd looks good. Don't bother with so-called girls bars or kyabakura. Clubs a viable option but I've never gone that route personally.
I would estimate the market split of girls who like/are ok with facial hair and girls who arent at around 35/65%. I've lived here and spent long periods with both facial hair and no facial hair. No facial hair has worked better for me. Your mileage may vary. Baby-face is likely to be an advantage here and make you more approachable. Tough guys more likely to be viewed as scary than sexy. These are generalisations so you'll have to decide yourself.
Good luck and good hunting.