Shun's ability to adapt to these little events is a truly great but understated quality. Or I guess, more specifically, I love his internal monologue and how earnestly he often tries to wrap his head around "the romance" Chokki (and friends) display. It's a bit hard to explain but I think things like him observing and trying to understand the acorn rates feels like a sign that he's just a very sweet kid by nature. There could have so easily been a jackass MC that constantly complains about getting dragged into things by an annoyingly persistent girl (and there are many, many stories like that - some of which are even good!) but it's such a breath of fresh air that Shun's first instinct to anything is to try and understand rather than be judgmental.