Koi Kaze, Aoi Hana Recommendations
I found Koi Kaze and Aoi Hana to be similar in that they both present a romance that may be considered taboo in a very gripping, real, serious, and tasteful manner. Koi Kaze deals with an incestuous relationship across a large age gap, and Aoi Hana presents yuri relationship between teenagers. Neither show contains any fanservice, and both have practically no humor. They share a similar tone, and both touch on the real social ramifications of being involved in a non-standard love. The shows are also both paced similarly with the story spread evenly across the series - little episodic storytelling.