The energetic princess of the Western Empire, Sierra, met the prince of the northern kingdom, Latio, when they were young. Gradually, they grew close to each other but the young king of the Eastern Empire, Nia, was also eyeing them.

The peace they were experiencing was only superficial and war was brewing. Sierra and Latio had to set aside their childhood and make a choice between love and duty: sword and blood, smoke and tears, sincerity and betrayal, all of these are weaved together to compose the song of Theodore.