A summer holiday of victories and losses

Today is the day I go to school during summer vacation. As usual, Spank and Aiko, who are going to school, encounter Seiya, who is playing a big fight against delinquents on the way. It was Spank who was so strong that I couldn't help but be dazed. At that time, Aiko's student ID card, which fell on the road, forced Seiya and Ryo to have a duel. The place is going to settle by swimming far to the sea - a large rock off the coast. Aiko and the others stop them, but Oyama, Nezu, and even Spank are the ones who make them two of them, so they finally jumped into the sea...