Reunion at the Starting Block!.Second-year high school students, Haruka Nanase and Makoto Tachibana, run into first-year transfer student, Nagisa Hazuki, a fellow team member at a local swim club when they were children. The trio sneaks into their old pool building to dig up a time capsule they buried when they are reunited with Rin Matsuoka, the fourth member of their former team who left during middle school to study in Australia. Rin is rude to them, immediately challenging Haruka to a race. They nearly face off until discovering the pool is empty. The following evening, the trio meets with Rin's younger sister, Gou Matsuoka, who informs them that Rin now attends Samezuka Academy. They visit the academy's luxurious nanotorium, breaking in after hours only to be discovered by Rin, who orders them out. Haruka steps out of the pool and challenges Rin to a freestyle race.