While Aiichiro Nitori decides on a graduation present for Rin Matsuoka and Sosuke Yamazaki, Momotaro Mikoshiba wins tickets to the Anago Hot Springs, which they present to the two through an elaborate scavenger hunt. During the trip, Momotaro gets into a heated competition with the captain of Soufukan High School's swim team over a capybara plush toy. Natsuya Kirishima, an alumnus of Soufukan High School and chaperone to their training camp, offers wise words to Sosuke over his shoulder injury.