Thoughtful Beginner Manga?

I’m looking to read a beginner manga that you found really interesting, thoughtful or genuinely delightful. I’ve tried reading manga such as One Piece and Naruto, but found them heavily action-based, and the repetition of the plot grew tiresome after a while. I really enjoyed reading Tezuka’s works in English, but I’ve heard they’re written in older and more complex Japanese than I’m able to handle right now. Does anyone have any suggestions for a thoughtful beginner manga to give a shot at?

Aria the Masterpiece! Pretty good for beginners I’d say, and it’s got some really interesting themes and recurring elements.