Ito Yui, the book club president, stays rooted to the ground while she darts a look from Sakura's direction to Rin and back to Sakura once again without having any idea what is going on here.
Finally, after being silent for a couple of minutes, Yui finds the chance to speak and immediately interferes between the two parties before the situation gets out of hand.
Clearing her throat, Yui says, "Guys, let's just chill alright? How about we proceed to our shopping plans just like what we had planned earlier in our group chat, Hayashi-san?"
That's right. The club president had already added her newly recruited members to their group chat to discuss things that are related to the book club.
Before Sakura responded to Yui's words, Rin, on the other hand, sees the shopping activity as an opportunity to get closer to her enemy.
Thus, she interjected, "Shopping? I love shopping! Lemme join you!"