Kimi no is in the cute side, while River is the up lifting song pumps you up.
I like when the guy explained why the songs were chosen like on the 1st stage. I wish the other three doing the same.
Anyway, here some clip performances of the 4th stage.
AKB48 151108 End Roll (Mariyagi, Tano, Abema, Yuami)
Yagiii... I didn't know she can do that.
(from: http://cubo48.tumblr...yagi-tano-abema )
AKB48 151108 Temodemo no Namida (Maki, Yuichan)