How do single parents enjoy their stay and can children come with them to experience the bars and clubs?
How are single parents and their children or child accomodated by Japanese hospitality? Can single parets go to places freely with their children? What are the restrictions on bringing children along to sites and evening activities?
I do not think that single parent are treated differently by Japanese hospitality. I am not really sure of how they would need to accomodate to a single parent compared to parents that are not traveling alone. Unless it is clearly not an appropriate place for children, it should be ok, to bring your children. It also depen what age are tour children. As for bringing them to bars and clubs, I do not want to be impolite, but you might want to reflect a bit on that, these are clearly not appropriate places to bring kids. Just think iy you would do it where you live. If not, then don't do it in Japan. I would seriously not bring kids into pachinko parlor (extremely noisy) or in 18+ rated area of some stores (like area where they sell sex goods, including manga, video and toys).
I guess the only thing you should know is that if you decide to go to a onsen, it is ok for parents to bring their child of any gender to bath with them. There is no strict age limit, but around 5 is probably the max that is generally ok.