This is a fantasy world where elves and humans live together. Humans and elves of different races each have their own sanctuaries and territories.
Humans cannot use magic, while elves can use all kinds of magic through elven songs. Elves who cannot use elven songs are regarded as "Voiceless Ones" connected to the Demon King, and are scorned by everyone.
One perfectly ordinary day, Alex, a wood elf who runs an elven waystation, receives a mysterious commission to find the thief who stole the royal song.
Driven by a sense of responsibility, Alex takes on the job.
And so begins a chaotic, topsy-turvy journey...
Theme: If you want to do it, go for it.