S1·E10 A Trip With Just the Two of Us?! No Way!

At the inn, Ajisai insists on paying the full bill, but Renako, wanting to split it “like friends,” challenges her to a game of ping-pong. They clash, grow a little closer... but Renako loses, and now the two of them are alone in a private hot spring. This isn't exactly normal “friend” distance, is it? Wait, why is this starting to feel kind of... steamy!?