Titre original : Tempestuous Water Riding Battle
The boys are upset that, at the girls' request, swimming classes are to not be co-ed. In keeping with Tenbi tradition, they propose to resolve the issue with a water cavalry battle. The girls agree, even though it means appearing in their swimsuits for the competition itself. No one seems to hold it against him when Takeru cheats, but with the arrival of Minerva Martha, the final member of Venus, he has no chance to enjoy his victory.