I'm not entirely sure as I haven't read it specifically. But generally, a visual novel about two characters like Jumin and Zen might be about their relationship, their individual stories, and the events that unfold in the world they are in.
The availability of Zen's visual novels varies. Sometimes it could be announced on specific gaming or literature forums. So, regularly checking those could give you the info you need.
Funny Zen stories usually carry a message of acceptance. They show that in Zen, all things are as they are. For instance, a story could be about a clumsy novice monk who keeps dropping things. Instead of scolding him, the master says it's all part of the learning process, teaching us to accept our own imperfections and those of others.
To know Jumin's age in Another Story, you'd likely have to comb through the story carefully. Sometimes it's explicitly stated, or you might have to infer it from context clues.
Another funny Zen story is that a seeker came to a Zen temple and asked the master how to find enlightenment. The master pointed to a tree and said, 'Be like that tree. Stand still in the wind, and let the world pass by without getting caught up in it.' It shows the Zen idea of detachment in a rather humorous and simple way.
In the history of zen, there are some names that have been passed down. For example, there are collections of zen stories that are named after the era in which they were popular. However, many of these traditional names are in Japanese or Chinese and might need to be translated for a wider audience. And some traditional names might be very simple, just indicating that they are zen stories, like 'Classic Zen Stories' which has been used for centuries to refer to a body of zen - related tales.
As far as I know, it's difficult to point out a popular 'zen translations novel' without more details. There are many novels that might incorporate Zen ideas but may not be explicitly named in this way. However, if we consider works that have a Zen - like feel to them, Hermann Hesse's 'Siddhartha' is often thought of as having strong Zen - influenced themes, but it may not be what is directly meant by 'zen translations novel'.
I'm not sure specifically what 'zen translations novel' is about without more context. It could be a novel related to Zen philosophy that has been translated. Maybe it's about the spiritual journey in the context of Zen, or it could be a fictional story that incorporates Zen teachings in some way.