8 chapters in and, nope, still not feeling any romantic chemistry between the two of them. Nasa is certainly ga-ga over her, but she seems to be acting more like a smug, condescending nee-san than a wife. Sure, she calls him "dear" and admits that she's his wife, but there just doesn't seem to be any spark. It certainly feels more like an arraigned marriage (or a marriage of convenience) than that of a loving couple.
Now they are going through some of the motions of being married, but not a marriage I'd wanna be in. It's more like a couple of young teenagers playing house: the boy who's like a puppy dog that obediently follows his master around (sit Spot, go to bed Spot, hold hands Spot), and a girl who will play along until she gets bored. And, of course, she will remind him that they are playing house, not playing doctor.
So why Nasa? Is there something special about him, or would anyone have been okay as a husband? If she fell in love with him when they first met, like he did her, she sure has yet to show any signs that that is so. She's more like a foreign spy who's been taught how to be a wife, then sent abroad to be a sleeper until the right time. Or, alternatively, sent back in time to steal the plans to whatever top secret project he eventually creates. Of course, she might just be a alien... And there is a theory floating about that Nasa is actually dead and that Tsukasa has created this fantasy world for him in order to guide his soul to the hereafter...
With each successive chapter there are new questions, yet none of the old questions get answered.