In some ways, it can be ethical. But one should always respect the boundaries of the women at the bar. If the intention is just to have a good chat and get to know someone, that's fine. However, if there are ulterior motives like taking advantage, then it's not ethical.
In my opinion, it's not the best place to start a relationship story. Bars often have an atmosphere of alcohol and sometimes a bit of chaos. Picking up someone there might give the wrong impression. It's better to meet in more neutral or positive settings like a coffee shop or through mutual friends, where the focus can be more on getting to know each other's true selves.
I wouldn't recommend trying to pick up women in a grocery store. It can come across as creepy or inappropriate. Just be friendly and natural if you happen to strike up a conversation.
The plot of the novel was like this:
The main character was a young student who could see ghosts. Due to an accident at home, the protagonist decided to give up his studies and work part-time as a waiter in a bar. At night, the bar would receive the ghost guests, and the protagonist would chat with them and help them solve their psychological problems. However, in the process, the protagonist also discovered many mysterious things, such as his background, the secrets of the bar, and so on. It was still unknown whether the protagonist would be able to solve these mysteries and solve all the ghost guest problems.
It's not a good idea to have such intentions. Trying to pick up someone based on this specific situation can come across as inappropriate and disrespectful.
Yes, it is ethical in most cases. People go to bars to socialize. As long as you approach a woman with good intentions, like getting to know her as a person, not just for some improper motives, it's ethical. For example, if you see a woman reading a book at the bar and you start a conversation about the book, that's a positive and ethical way.
I recommend Super Vitality! The Miracle Princess of the Other World is for you. Although it was a little different from the female protagonist picking up star-shaped sand on the beach, the female protagonist in the novel also picked up a magical bottle under unexpected circumstances and started an adventure in the other world. This is a healing, sexy, hot-blooded, and touching fantasy sword and magic novel. I believe you will like it. I hope you like this fairy's recommendation. Muah ~😗