Are you sure about that website? The onsen there is located 10 kilometers from the sea, and in southern Kyushu, far away from Chichibu.
That was a really nice "heartfelt declaration of affection and desire to stay together - without being an actual love confession".
Somehow I can easily imagine the dorm leader sleeping in a tent and climbing mountains. Special training: ascending the local "alps" with two bottles of spirits in her backpack.
I think she means that them ascending to 2600m caused the temperature to drop by 16c relative to the sea level. So if it's a sweltering 35c in Tokyo, it's a nice 19c in the mountains.
I see how you can play tactically with this. The upper players aren't obliged to create the strongest possible hand. If they think they are going to lose the hand anyways, they can choose to create a weaker hand in order to preserve or use up key cards for the future rounds. Of course...
For those who would like to try reading the Japanese versions, this chapter is near the beginning of volume 11 out of 12. So you'd need to get two volumes to finish the series.
After a bit of thinking, I've solved it. It's quite a simple game. The player whose move makes the situation symmetrical will win. The player whose move breaks the symmetry will lose.
By "symmetrical" I mean a situation where both pairs of coins are the same distance away from each other. The...
For those who care about geography, this is Hateruma island. The main island they were on was Ishigaki. The island where they were supposed to go was probably Taketomi, where the recently released Non Non Biyori Vacation largely takes place.