No, it's not appropriate. Such a relationship can be seen as inappropriate and potentially harmful, as middle schoolers are minors and should be protected.
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.
It's not really appropriate. Such a storyline could raise ethical and moral concerns.
One story that many middle schoolers know is 'The Adventures of Tom Sawyer'. It's a classic that's often read in school.
One middle schooler's Thanksgiving story could be about helping their parents prepare the big Thanksgiving dinner. They might talk about how they learned to make the perfect mashed potatoes or how they set the table in a really creative way. For example, they could use fall leaves as part of the table decoration.
Well, there could be ones where the older man is a mentor or a guardian to the middle school student, maybe in a coming-of-age story.
Well, he could start by being a good friend to her and showing his kindness and care.
It could be a wild and unexpected plot twist. Maybe the girl has some sort of personal motive or is driven by external circumstances.
Well, he could start by being friendly and showing genuine interest in her hobbies and activities.
One 'Shrunken Middle Schooler Story' could be about a middle schooler who suddenly shrinks during a science experiment gone wrong. They then have to navigate their now - giant school and deal with the challenges of being tiny, like avoiding being stepped on by classmates.
Sure. There could be a story where an older man helps a young boy who has lost his way in a forest. The man uses his experience to guide the boy back to safety. It's a story of kindness and survival, not related to any inappropriate content.