I'm probably gonna get flamed for this but I'll say it anyway:
The problem isn't tsukushi, or even the domyoji conglomerate, it's tsukasa himself.
He's like a broken record saying he's not a kid anymore...

What he has to do is take the reins of his life, make a decision, take over the company because it's his duty, his responsability, study, better himself, AND fight for his love, his own happiness, he knows the only one for him is tsukushi, acknowledge it, make her accept it too, work together, damn it! (i'm getting all worked up now)
I would say he's still a teenager in his mind, while tsukushi is already a young adult. He needs to
really grow up, not just say it.
It's like what shizuka said on ep. 4, people can be divided into those that surender to their duties and those that follow selfishly their own desires. But, I would include also those people that can make both choices into one, those are the really capable, lucky ones. I think Domyoji and makino are the third kind, they can do it, if they compromise, if they choose to go for it.
..........................................and..... breath................................
anyway, hehehehe, sooooooooo...... the flavor of love is fishy 1-year-old cookie?

That was great.