Yuta is the administrator for Shirasu Wave, an app that offers information on wave conditions. Many surfers are grateful to him for his daily updates on the weather, wind, and waves in Shichirigahama. Yuta begins acting strangely, not eating all of his favorite shirasu, skipping practice, staying home from school, and stopping service for Shirasu Wave. Is he planning to quit surfing? Worried, Masaki searches for Yuta...
If I were to do that, I'd have to go back 
15 generations, to the Warring States era,
إذا كنتُ سأفعل ذلك، فعليّ العودة 15 جيلاً 
للخلف، إلى عصر الممالك المُتحاربة
D-Dann müsste ich
15 Generationen zurückgehen
Tendría que remontarme al periodo
Sengoku unas 15 generaciones atrás
Tendría que remontarme al periodo
Sengoku unas 15 generaciones atrás
Dans ce cas, il faudrait que je remonte
quinze générations, à l’époque Sengoku,
Per farlo dovrei tornare indietro
di ameno 15 generazioni, fino al periodo Sengoku,
Se fosse assim, eu teria que voltar
15 gerações, para o período Sengoku,
Пришлось бы отследить все
15 поколений до эпохи Сэнгоку