No worry, such limitations are not written on their web site,
and you can find some male customers are also shown in the photos, open URLs again.
But in Japan, plum wine(~ð ume shu) and fruit liquor(ÊÀð kajitsu shu) in this bar are NOT sake(ð)
that most Japanese men like to drink, it means more than 90% is female customers.
BC most Japanese women drink while worrying about drunkenness, health and last train.
Japanese men do not dislike fruit liquors, a ton of "wine(C)" lovers existing.
"~ð" in English the word "wine" using, but strictly the making method is different.
This is homemade "how to", https://youtu.be/emgHzVoJCUc
but the taste changes not only the quality of plum seeds, but also by the type of alcohol and sugars.
However, "~(ume)" is not strictly the word "plum" as botany,
it is better to use "Japanese apricot liquor" but too long and also the word "apricot" is not ~,
so "ume shu" as loanword like "karaoke" and "Pokemon" is the best but it seems that it is too late.
Anyway, their bars have also beer(r[) though, but no wine and no enough food menu for hungry man.
If still wondering you should send e-mail ASAP. (contact mail)