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If you're looking for manga similar to Otona no Manaa, you might like these titles. All recommendations are made by Anime-Planet users like you!
Both of these are shounen-ai one shots that reminded me of each other. They both involve a younger rash man who falls for an older man. If you enjoyed one, you'd probably enjoy the other.
Both of these are yaoi one-shots about the relationship between an employee and their boss. If you like the genre, and enjoyed one, you'll enjoy the other as well.