Well, even Seiji realizes that Midori can’t keep going like this, being his right hand for the rest of their lives. They need her to return to her own body, and that was something I liked about Seiji today—that maturity to say 'this can't go on like this.' As for Midori, well, I feel like she leaves a lot to be desired in this episode. She seems like a somewhat empty character, since they are practically confirming that her only purpose is to be there and serve Seiji.