You're My Pet Volume 6

Everyone muses on how they don't understand Sumire. But Sumire's "pet" Momo understands Sumire all too well. When everyone cuts in front of Sumire in line, Momo teaches her that if she doesn't stand up for herself, she will lose something precious. In the same way, Sumire is there for Momo when someone tries to sabotage Momo's performance.