This is one of the few dramas where I am in love with the Female Lead more than the Male Lead (not that the male lead was in any way bad, but Mikuri was really something else and just too cute for words to express) Anyway, this drama deserves all the praise that it receives as one of the best contract marriage dramas out there. It takes such a surreal plot and makes it so... real. The arrival at a de facto/fake marriage is reached with rational logic, isn't rushed and you can see how both leads find themselves leaning towards giving it a go. Their chemistry is great and the build up is so fluffy and endearing.
Not to mention, one of the things I love about a josei over a shoujo is how complex personalities can be. Instead of the flat cold hearted guy and ditzy, naive girl, Tzusaki-san is not actually cold but just acts distant due to shy and awkwardness while Mikuri is naive but not to an unrealistic degree for her age and although very free spirited and cheery she's not to be underestimated as she's very perceptive and goes for what she wants.
One flaw I will admit is getting a bit frustrated between episode 6 and 7, but I watched it through til the end and didn't regret the decision at all.