Having rescued Nobuna Oda he helps Nobuna in her ambition to conquer and unite Japan under her rule .
Nobuna Oda is a teenaged girl version of his world 's Oda Nobunaga .
Having rescued Nobuna Oda , a teenaged girl version of his world 's Oda Nobunaga , he helps Nobuna in her ambition to conquer and unite Japan under her rule .