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I second Steins;Gate. Probably one of the best anime out there (being it my favorite).
The main focus may seem to be the sci-fi element, but it will become just a background for an awesome romance later on. It counts 24 episodes, it's long and the romance slow, but you'll love it. Just so you know, it plays around time travelling but it's settled at a normal flat(homemade lab lol), involving 18 aged characters, normal world, no impossible things, no slapstick humor or some retarded stuff. Pretty serious, but the protagonist will make you laugh. The romance surely is deep and is the main reason why i checked this title and... i was satisfied very very much. It fits your requirements: awesome artwork, mature, and can't say anything else about the ending. Just watch it.
After reading the first two lines of your topic, S;G immediately popped up in my mind. Have a nice watch, this is your best bet imo.
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