Hi!
Today let me talk about Japanese solo-culture as a business idea. It is very common for Japanese people to enjoy something alone in our daily life. Especially, I'll focus on solo-lunch culture.
When I came to Canada, I realized this is not popular for European, American and Canadian people around me. Except for Japanese, people might think eating alone is lonely and the thing those who don't have friends or family do.
However, in Japan, we have many kinds of restaurant we can eat alone easily like ramen, beef bowl, casual dining restaurant and even Japanese BBQ! Nobody do not look at you as a lonely person since it's a quite normal option regardless of married or single. The pic below is a famous ramen chain restaurant. We even do not have to talk to a server. Self-service including order and payment make us focus on taste food deeply. At the same time, it reduce our direct labour costs and promote efficiency.