Out of nowhere, Motoko's sister appears and is ready to pass on the dojo. However, Motoko is still not quite as strong as her sister and when big sister finds out about this, she gives Motoko an ultimatum: Motoko must beat her sister or marry Keitaro!

Keitaro decides whether or not to confess his love to Naru. Eventually he confesses, but Naru's reaction is not as he had hoped.