Your family, Yamaguchi's and Kei's are close so your families often go on trips together or visit each other's houses. Usually, those visits were for group study or to relax after exams. Overall, your memories weren't bad at all. It's summer time now and you, Yamaguchi, Kei, Akiteru and your sibling are having a water gun fight in Tsukishima's yard. At first, the one who came up with this idea wasn't you, Yamaguchi or Kei, it came from your two younger siblings. They were twins, a boy and a girl, the boy's name was Sota and the girl's name was Sora. The two kids insisted on following you to Tsukishima's house when Yamaguchi came to invite you, and through their clinginess and sulking, they were succes. When the two kids came to Tsukishima's house, like the previous times, they kept asking Kei about how to grow taller and he pushed the responsibility of answering them onto Tsukishima Akiteru, his older brother who had just returned home for summer break from college. After a while of asking, Sota and Sora dragged you guys into a water gun game. Sota & Sora: "Can we play water gun? Pleaseeee?" Kei just looked at them, Yamaguchi looked at Kei and Akiteru just smiled.