Well, that's a rather strange concept. Maybe it's a fantasy story where magic turns a man into a massive island. But I haven't read anything exactly like that.
It could be a survival story. The kids might have to face challenges like finding food, shelter, and dealing with wild animals.
It might be a story that focuses on the internal struggle of the gay man as he faces the perils of war while also dealing with societal prejudices, ultimately meeting a fatal end.
It could be a variety of cartoons. Maybe it's a funny comic strip or a detailed illustration for a children's book.
It might be a psychological thriller. Perhaps the rich man has a deep-rooted trauma or mental illness that drives him to this extreme behavior. Or maybe it's a commentary on wealth and morality, showing how money can corrupt a person's sense of right and wrong.
It could be about his survival, adventure, or inner struggle to cope with being alone.
Such a manga might have a plot where the older man and the middle schooler have a unique friendship or adventure. It could also involve elements of learning and growth for both characters.
This was " Crusoe."
There are several possibilities. Maybe in cartoons based on myths and legends, there could be colossal human-like figures. Or in some dystopian future cartoons, there could be engineered or mutated beings that are really really big men.
Maybe it's a romance manga where the man meets his love on the island and their story unfolds. Or it could be a mystery manga where strange things happen on the island after he moves there.
It could be a survival-themed seinen manga where the man has to overcome various challenges to stay alive on the island.