Naono Bohra is, in my opinion, one of the best BL mangaka currently publishing. Not only is her art beautiful, but she also introduces themes not ordinarily handled by other mangaka. Many of her characters possess slight disabilities or are older men who actually look like older men (rather than 40 year old characters who look like they’re 12). She is also adept at short-form storytelling, something that I believe other mangaka struggle with. In my opinion, Itsuka no Himitsu is her greatest achievement at bringing all of these things together.
Itsuka no Himitsu is my favourite BL manga apart from Yamane Ayano’s Finder series. Naono Bohra is one of the only mangaka (BL or no) who is capable of providing readers with such an interesting, well-characterized manga in such a short form. The story is romantic and touching without being overwhelmingly sappy or unrealistic. The characters are interesting, and despite how short the series is, they are not one-dimensional at all: sensei succeeds brilliantly at allowing readers to get to know their strengths and weaknesses.
I would recommend this series to just about anyone who likes BL.