Naru finally confesses that she believes Mutsumi is Keitaro's promised girl—and comes to terms with her own feelings for him. Meanwhile, Keitaro discovers the truth about the promise. But with his heart now torn between that old vow and his growing love for Naru, he must make a choice: past or present?

Motoko's older sister, Tsuruko, comes to bring her home to take over the family dojo. Desperate to escape that fate, Motoko pretends Keitaro is her fiancé. But the ruse backfires—Tsuruko shatters Motoko's prized sword and banishes her from their martial arts school. Devastated and directionless, Motoko must now decide where her heart truly lies.