The fact that everyone is just going about their life while Kon is missing just doesn't make sense
well, i already try to put my spin of it in previous chapter. but anyways, here is something worth to take into account:
-Remember she just missing since yesterday, and now is the morning after.
-who else to react beside Furuka ?
-Furuka is just assume that it is Kon who take her home, which i think make sense by on her POV. she wake up at home safe and sound. What esle bring her home if not Kon ?
-also the previous time, same thing happen. When Kon taken by "monster". Furuka wake up alone, Kon wake up at home safe and running around and found Furuka. So it is not strange that it is now her turn, she just looking for Kon home now assume Kon is back at home as well.