Feeling relieved because she had made a friend? This way of thinking probably only existed in this country—if this had been a high school in the Celestial Empire...
While their families would not object to them socializing with others, they definitely would not feel relieved. They might even wonder, "Won't that person affect our child's grades? The college entrance exams are coming up!" Feeling relieved was impossible. Absolutely impossible in this lifetime!
This was what they called cultural differences. Mashiro's common sense had been close to nonexistent to begin with. Although she had improved considerably since she first arrived, even if she possessed ordinary common sense, she probably still would not have understood such cultural differences.
But Yukinoshita Haruno did not know any of that. All she saw was Mashiro playing dumb by taking advantage of her innocent and childish persona, not only causing Haruno's probing to fall flat, but also...
"Hehe, little Mashiro, you really know how to joke around. To be honest, while little Yukino..." Of course, a single failure was nothing to Yukinoshita Haruno. She intended to seize control of the rhythm first.
But before she could finish, Shiina Mashiro said, "Yukino is cool."
Yukinoshita Haruno, who had originally wanted to use a "while... but..." approach to advance by retreating, instinctively followed along. "That's right, while Yukino is very cool..."
Yukinoshita Haruno: "..."
Wait, what kind of description was that? Was "cool" something used to describe girls? How was she supposed to continue with the "but"?
While Yukino was cool, she was not cute enough? How could her little sister possibly not be cute?
While she was cool, her personality was too prickly? If it were "cute," then saying she had a prickly personality would work, but if it was "cool"... She was already cool, so how