Momotaros no Natsuyasumi

Momotaros boasts about his strength until Master Sha-Fu exposes one weakness: he cannot swim. Urataros, Kintaros, Ryutaros, and Deneb get involved in his training, turning the effort into a noisy mixture of teasing, enthusiasm, and competing advice.

Deneb tries to convince him that confidence will carry him through, but believing he can swim and actually doing it prove to be different things.