A typical Japanese schoolboy and hikikomori, Kyo Nukui, tries not to go out unnecessarily. He spends all his free time creating songs in Vocaloid and uploading them online. But one day, his routine life is disrupted by a letter from a fan requesting a meeting. Arriving at the appointed place, Kyo is surprised to find that the letter came from three cute elementary school girls. The girls decided to form a band, and Kyo was invited to help them by sharing his talent in songwriting.
