If there is a problem with the disc that comes with the Hatsune Buta Festival, you can try the following solutions: 1. Return and exchange: If there is a problem with the quality of the disc, you can consider returning and exchanging it. You can consult the 2D fanatical customer service center about the specific process of returning and exchanging goods and submit relevant evidence to obtain support. 2. Refund: If you don't want to return the goods, you can consider a refund. You need to submit a refund application to the 2D fanatical customer service center and provide relevant evidence to prove that there is a problem with the disc. If the customer service center agrees to the refund, the refund amount will be returned to the payment account according to the agreed amount. 3. Self-repair: If there is a problem with the disc itself, you can try to repair it yourself. The problem could be solved by re-downloading or purchasing other free discs. 4 Contact You can consider contacting the author or the publishing company of Hatsune Buta Festival to reflect the problem and provide solutions. You can contact relevant parties for help through official websites or social media platforms.