Gougyo no Gyō (轟魚の形, literally the Way of the Thunderfish) : One of the ways of Ryūha Koei Sōgetsu. This method uses specialized swimming and underwater techniques.
- Suihei Shachi(水平遮馳, lit. Rapid Surface Break): To save himself and Marokichi from being sucked into a hole in school swimming pool, Rintaro is able to propel himself upward like a fish leaping out of the water, (or like a sub-launched Polaris missile). The sudden acceleration is so great, he's able to carry a person out of the water and land on the roof of a building several stories high.
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