第 4 集: Kintaro 在學習游泳的同時，向一位前奧運游泳選手發起挑戰進行比賽

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Kintaro has challenged the local swimming coach (and former Olympic athlete) to a race, but he first needs to learn how to swim. While training, however, his situation with the coach, Ayuko Hayami is compromised. (Source: Wikipedia)