 If you liked
Wakakusa Monogatari: Nan to Jo-sensei
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 ...then you might like
Romeo no Aoi Sora
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Both are book-based slice of life stories set in history and made by the same director. The story focus on the characterization of a children group. Both series highly emphasize on educational values in various ways. Nan to Jo sensei is episodic in nature while The Black Brothers tend to be more dramatic and regular in the narrative.