Please be sure to contact us by email in advance. In the case of products that have already been delivered, we require that you contact us within 7 days of receipt. We will contact you about the return method and exchange later. If you do not contact us, we are very sorry, but we will not be able to respond. In addition, we may not be able to meet your request if the product is not ready for shipment, returns or exchanges are not accepted, or it cannot be judged as unused.