First Swim in Another Country!.Rin meets Natsuya Kirishima, Ikuya's older brother, who is racing in international relays for cash prizes. Natsuya wants Mikhail as a coach, but Mikhail says he lacks the proper muscles and that his focus seems to be elsewhere. Rin doesn't hesitate to point out Natsuya's unhealthy habits, while Natsuya teases Rin about his divided thoughts regarding certain friends. Their camaraderie leads to a race aborted by rain with Natsuya returning to Japan for Ikuya, as well as to seek out Nao Serizawa, his own close friend since middle school.