Despite the foreshadowing shown in context, you could not exactly anticipate what would happen right from start to finish. That could be a reason why you could end up marathoning the entire series in one go.
While at a glance it seems like a Yuri/Lesbian drama, it is *far* from one; I have to say it is not even one at all. The story and the characters revolve themselves around character relationship development, human drama, and psychological factors. If you have watched one of Nojima Shinji's work, then you would understand what I mean.

The story goes by in a rush - Yuri meeting Kairi again after so long, and then Kairi suddenly being really friendly and engaging with Yuri. The whole interaction does not really sink in just yet - and it's natural to be suspicious of a character like Kairi who just came from nowhere and on pure coincidence - but Yuri's innocence and honest personality allows Kairi to quickly become a part of Yuri's daily life.

Yuri Dano Kan Dano's story line is not its strong point, but the cast involved in the production of this drama. They're the main reason I decided to finish the drama. They had a strong dynamic and were able to build characters that stuck to their personalities. Baba Fumika was able to portray Yuri's pure and innocent, easily swayed but strong-willed personality really well. Kojima Fujiko was also able to bring out Kairi's mysterious and multifaceted character to life. If Yuri is a light, then Kairi is a shadow. The rest of the cast's characters were not specifically given time to be likable due to the limited amount of scenes they had; Zaiki Takuma's Shuji was able to stand out though. I have to applaud his portrayal of Shuji's fun and quirky playboy persona.

To sum things up, this drama tries to show the contradicting sides between a person who is too innocent and honest to see the darkness in people's hearts and a person who has been in that said darkness for a long time and longs to become someone who has yet to be tainted and wants to be loved without judgment and foul intents. The drama tries to show the dark sides that people may have inside their hearts - wanting, jealousy, greed, longing, and such. It doesn't specifically 'fix' those parts, but shows them to us. Kairi becomes a means for Yuri to see such a dark world while trying to protect the latter from getting tainted by it. The friendship they share does go beyond the accepted relationship between friends - they explore different contexts that may be a taboo to talk about in a conservative society like Japan - making them much more mutual than common friends.

I would not go out to recommend this drama, but if you are a fan of the cast, then you would enjoy the interaction they have between their characters as I see them challenging themselves and going beyond the norm. Just keep in mind that, again, the story, imo, is not really something worth getting into.