Are you familiar with "Yatta"? A bunch of comedians made a fake music group "Happatai" and sang about how they're happy as long as they have even just one leaf to cover themselves... how even the smallest things are worth being happy about.
This group would burst into a scene when Teruyoshi was feeling depressed (for example: he gets fired, or his wife is cheating on him, etc).
Okai was being so upbeat about simple things, that she reminded me of Happatai.