Question about the ending (Spoilers!)
Obviously this involves spoilers, so please stop reading if you haven't seen the movie....
Now the question: near the end of the film, Ryota and Midori take their biological son Ryusei to visit the Saikis, the couple who raised the child (in fact, Ryusei still wants to return to them). While at the Saikis' place, Ryota is reconciled with his adopted son Keita, who he has grown to truly appreciate.
Does all this imply that Ryota and Midori intend to return Ryusei to his adopted parents and take back Keita? That is the impression I received, though I realize Koreda could be keeping things ambiguous. What do you think?