She wants to trust him, yet she cannot do so because of her past experiences of being betrayed. The moment she learned about her childhood friend, something inside her broke. Her behavior recently is disgusting. What on earth is she doing acting jealous when she has such little information? She doesn't even know much about the girl yet.
It is normal to have a childhood friend of the opposite gender; it was the same for her. Nao and her cousin Hijiri are both guys. But, she still feels strange.
"Your imagination is wild, my dear. Those two are not a couple."
"That is true, but that girl likes Yuhi." Sumire only observed her for a few seconds, but it was enough for her. Occasionally the girl would stare at Yuhi for longer than she ought to. Whenever she talked to Yuhi, her tone seemed brighter.
Sumire sighed deeply. Sometimes she wishes she wasn't so sharp; if she wasn't, then she wouldn't have noticed such things.