J-dramas in my experience always mean some sort of cliché-adhering, trope-involving affairs, mixing romantic themes and coming-of-age themes, etc., that moset of the time barely make it above the cut.
This show however really struck me as departing from all of that and honestly presenting a premise of: what if a 30y+ old girl got "stuck" in her relationship that seemed to not go nowhere and met someone who's 15y old and made all her life feelings in question? It's naive and dramatic on so many levels, starting with the age gap, but sadly if you're like me you can relate to the dimension of being older and seemingly all the sparks of life are diluted into nothingness and though you're not even 40 you feel like you're dead... SO... this one premise really moves you.
Together with all this, the cinematography on this show is WAY above average. In many of the multiple 25 min episodes I felt like I was watching a masterpiece movie from a respected cinematographer - this never happens on an american TV show. It's a TV series that feels like a succession of very good quality indie movies with great taste.
It may start as just another japanese romantic show but it's incredibly WAY more deeper than that. So many things nowadays purport to be "feminist", whatever that means. Besides all that I've written above, this show has got to be one of few times I felt something true about that. Highly recommended.